Article(id=1244239604455420199, tenantId=1146029695717560320, journalId=1241755870837649424, issueId=1244239603624952467, articleNumber=null, orderNo=null, doi=10.19636/j.cnki.cjsm42-1250/o3.2023.026, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1686758400000, receivedDateStr=2023-06-15, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1774579438555, onlineDateStr=2026-03-27, pubDate=1708790400000, pubDateStr=2024-02-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1774579438555, onlineIssueDateStr=2026-03-27, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1774579438555, creator=13701087609, updateTime=1774579438555, updator=13701087609, issue=Issue{id=1244239603624952467, tenantId=1146029695717560320, journalId=1241755870837649424, year='2024', volume='45', issue='1', pageStart='1', pageEnd='144', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1774579438358, creator=13701087609, updateTime=1774590203812, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1244284757283025531, tenantId=1146029695717560320, journalId=1241755870837649424, issueId=1244239603624952467, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1244284757283025532, tenantId=1146029695717560320, journalId=1241755870837649424, issueId=1244239603624952467, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=61, endPage=73, ext={EN=ArticleExt(id=1244239605789208880, articleId=1244239604455420199, tenantId=1146029695717560320, journalId=1241755870837649424, language=EN, title=Analytical Solution of an Arbitrary-location Through Crack Emanating from a Nano-hole in Magneto-electro-elastic Materials, columnId=1244229834482757770, journalTitle=Chinese Journal of Solid Mechanics, columnName=Research Paper, runingTitle=null, highlight=null, articleAbstract=

With the development of engineering technology and materials science, pure elastic materials can no longer meet the application needs of materials in industrial manufacturing. Magneto-electro-elastic (MEE) materials have more complex internal structures compared to classical elastic materials, and the methods for solving mechanical and physical performance are more difficult compared to classical elastic materials. Therefore, the mode III fracture behavior of MEE materials with nano-defects (pores and cracks) is investigated in this study. Based on the Gurtin-Murdoch surface theory and conformal mapping theory, the mode III fracture properties of MEE materials containing an arbitrary-location through crack emanating from a nano-hole under anti-plane mechanical loading, in-plane electrical loading, and in-plane magnetic loading are studied. The accurate solution of the MEE field in the matrix is obtained using the MEE theory and the far-field loading conditions. Analytical expressions for the MEE field intensity factors of the tips at both ends of the through crack, assuming that the surface of nano-defects is magneto-electric impermeable, are given. The proposed method is validated through a comparison with existing research. The effects of crack location, crack interaction, and the application of multiple physical loads on the dimensionless MEE field strength factors are discussed. The results show that the dimensionless MEE field intensity factors exhibit a significant size effect. The surface effect of nano-defects on the MEE tip fields of the cracks is constrained by the crack location. The dimensionless MEE field intensity factors are significantly affected by the ratio of the through crack length to the applied MEE loads. The results obtained in this study provide a theoretical basis for the experiments and numerical simulations of the mode III fracture behavior of an arbitrary-location through crack emanating from a nano-hole in MEE materials.

, correspAuthors=Junhua Xiao, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Junhua Xiao, Yuyan Xin), CN=ArticleExt(id=1244239667231568257, articleId=1244239604455420199, tenantId=1146029695717560320, journalId=1241755870837649424, language=CN, title=磁电弹性体中纳米孔边任意位置贯穿裂纹的解析解, columnId=1241831201896469478, journalTitle=固体力学学报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=

本文研究了反平面机械载荷、面内电载荷和面内磁载荷作用下磁电弹材料中含有纳米尺度孔边任意位置贯穿裂纹的Ⅲ型断裂力学性能. 基于Gurtin-Murdoch表面弹性理论考虑纳米缺陷(孔洞和裂纹)的表面效应,利用磁电弹理论和复变弹性理论获得了纳米缺陷表面为磁电不可通条件下磁电弹场的精确解,给出了贯穿裂纹两端裂尖的磁电弹场强因子的解析表达. 所得结果与已有研究比较说明了本文方法的有效性. 讨论了裂纹位置、裂纹相互作用与施加多物理场载荷对无量纲磁电弹场强因子的影响. 结果表明:贯穿裂纹裂尖的无量纲磁电弹场强因子尺寸效应显著;缺陷表面效应对裂纹耦合尖端场的影响受裂纹位置的制约;无量纲磁电弹场强因子受贯穿裂纹两端的裂纹长度比与施加力电磁载荷的显著影响.

, correspAuthors=肖俊华, authorNote=null, correspAuthorsNote=
**E-mail:.
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journalId=1241755870837649424, articleId=1244239604455420199, language=EN, label=Table 1, caption=

Magnetoelectroelastic constants of matrix material[23]

, figureFileSmall=null, figureFileBig=null, tableContent=
c44(GPa)e15(C/m2q15(N/Am)κ11(10-9C2/Nm2α11(10-12Ns/VC)μ11(10-6Ns/C2
445.82755.645.2297
), ArticleFig(id=1244274796016550323, tenantId=1146029695717560320, journalId=1241755870837649424, articleId=1244239604455420199, language=CN, label=表1, caption=

基体材料的磁电弹常数[23]

, figureFileSmall=null, figureFileBig=null, tableContent=
c44(GPa)e15(C/m2q15(N/Am)κ11(10-9C2/Nm2α11(10-12Ns/VC)μ11(10-6Ns/C2
445.82755.645.2297
), ArticleFig(id=1244274796071076276, tenantId=1146029695717560320, journalId=1241755870837649424, articleId=1244239604455420199, language=EN, label=Table 2, caption=

Two kinds of interface parameters of nano-defect surface[24]

, figureFileSmall=null, figureFileBig=null, tableContent=
材料常数
压磁相1003300.03
压电相25000
), ArticleFig(id=1244274796125602229, tenantId=1146029695717560320, journalId=1241755870837649424, articleId=1244239604455420199, language=CN, label=表2, caption=

纳米缺陷表面的两种界面参数[24]

, figureFileSmall=null, figureFileBig=null, tableContent=
材料常数
压磁相1003300.03
压电相25000
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磁电弹性体中纳米孔边任意位置贯穿裂纹的解析解
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肖俊华 1, 2, ** , 信玉岩 1, 2
固体力学学报 | 研究论文 2024,45(1): 61-73
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固体力学学报 | 研究论文 2024, 45(1): 61-73
磁电弹性体中纳米孔边任意位置贯穿裂纹的解析解
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肖俊华1, 2, ** , 信玉岩1, 2
作者信息
  • 1燕山大学工程力学系,秦皇岛,066004
  • 2燕山大学河北省重型装备与大型结构力学可靠性重点实验室,秦皇岛,066004

通讯作者:

Analytical Solution of an Arbitrary-location Through Crack Emanating from a Nano-hole in Magneto-electro-elastic Materials
Junhua Xiao1, 2, ** , Yuyan Xin1, 2
Affiliations
  • 1Department of Engineering Mechanics, Yanshan University, Qinhuangdao, 066004
  • 2Hebei Key Laboratory of Mechanical Reliability for Heavy Equipments and Large Structures, Yanshan University, Qinhuangdao, 066004
出版时间: 2024-02-25 doi: 10.19636/j.cnki.cjsm42-1250/o3.2023.026
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本文研究了反平面机械载荷、面内电载荷和面内磁载荷作用下磁电弹材料中含有纳米尺度孔边任意位置贯穿裂纹的Ⅲ型断裂力学性能. 基于Gurtin-Murdoch表面弹性理论考虑纳米缺陷(孔洞和裂纹)的表面效应,利用磁电弹理论和复变弹性理论获得了纳米缺陷表面为磁电不可通条件下磁电弹场的精确解,给出了贯穿裂纹两端裂尖的磁电弹场强因子的解析表达. 所得结果与已有研究比较说明了本文方法的有效性. 讨论了裂纹位置、裂纹相互作用与施加多物理场载荷对无量纲磁电弹场强因子的影响. 结果表明:贯穿裂纹裂尖的无量纲磁电弹场强因子尺寸效应显著;缺陷表面效应对裂纹耦合尖端场的影响受裂纹位置的制约;无量纲磁电弹场强因子受贯穿裂纹两端的裂纹长度比与施加力电磁载荷的显著影响.

磁电弹性材料  /  纳米尺度多缺陷  /  孔边贯穿裂纹  /  尺寸效应  /  裂纹位置

With the development of engineering technology and materials science, pure elastic materials can no longer meet the application needs of materials in industrial manufacturing. Magneto-electro-elastic (MEE) materials have more complex internal structures compared to classical elastic materials, and the methods for solving mechanical and physical performance are more difficult compared to classical elastic materials. Therefore, the mode III fracture behavior of MEE materials with nano-defects (pores and cracks) is investigated in this study. Based on the Gurtin-Murdoch surface theory and conformal mapping theory, the mode III fracture properties of MEE materials containing an arbitrary-location through crack emanating from a nano-hole under anti-plane mechanical loading, in-plane electrical loading, and in-plane magnetic loading are studied. The accurate solution of the MEE field in the matrix is obtained using the MEE theory and the far-field loading conditions. Analytical expressions for the MEE field intensity factors of the tips at both ends of the through crack, assuming that the surface of nano-defects is magneto-electric impermeable, are given. The proposed method is validated through a comparison with existing research. The effects of crack location, crack interaction, and the application of multiple physical loads on the dimensionless MEE field strength factors are discussed. The results show that the dimensionless MEE field intensity factors exhibit a significant size effect. The surface effect of nano-defects on the MEE tip fields of the cracks is constrained by the crack location. The dimensionless MEE field intensity factors are significantly affected by the ratio of the through crack length to the applied MEE loads. The results obtained in this study provide a theoretical basis for the experiments and numerical simulations of the mode III fracture behavior of an arbitrary-location through crack emanating from a nano-hole in MEE materials.

MEE materials  /  multiple nano-defects  /  through crack emanating from nano-hole  /  size effect  /  crack location
肖俊华, 信玉岩. 磁电弹性体中纳米孔边任意位置贯穿裂纹的解析解. 固体力学学报, 2024 , 45 (1) : 61 -73 . DOI: 10.19636/j.cnki.cjsm42-1250/o3.2023.026
Junhua Xiao, Yuyan Xin. Analytical Solution of an Arbitrary-location Through Crack Emanating from a Nano-hole in Magneto-electro-elastic Materials[J]. Chinese Journal of Solid Mechanics, 2024 , 45 (1) : 61 -73 . DOI: 10.19636/j.cnki.cjsm42-1250/o3.2023.026
磁电弹性材料[1]是一种可以实现机械能-电能-磁能相互转换的新型结构材料,具有压电、压磁和磁电耦合效应三种优良的特性. 由磁电弹性材料制成的构件广泛应用于检测技术、超声成像和传感器技术等高科技领域中的传感器和驱动器等智能器件. 磁电弹性材料在室温下力学性能呈脆性[2],脆性材料在制备和使用时内部容易产生裂纹,从而发生断裂失效.
材料中常见的缺陷包括孔洞和裂纹. 当缺陷尺寸在纳米量级时,其比表面积(表面积/体积)非常大[3,4],缺陷表面的原子占比非常高,其断裂性能受缺陷表面效应的影响,磁电弹尖端场具有显著的尺寸效应. 由Gurtin和Murdoch提出的表面弹性理论(G-M表面弹性理论)[5-7]通过引入表面应力考虑表面自由能的影响,在纳米尺度缺陷表面应用非经典的边界条件,近几十年来该理论广泛用于纳米尺度的缺陷问题(裂纹和孔洞). 研究磁电弹性材料含纳米孔边裂纹问题的代表性文献如下:Xiao等[8]基于复变函数理论,研究了考虑表面效应时磁电弹性材料含纳米缺陷(纳米裂纹和纳米夹杂)问题的III型断裂问题并给出了纳米裂纹尖端磁电弹场强因子解析解. Liu等[9]基于保角映射理论,研究了磁电弹性材料含纳米缺陷(纳米椭圆孔或纳米裂纹)问题的Ⅲ型断裂性能,给出了裂纹尖端断裂参数. 杨东升和刘官厅[10]研究了考虑表面效应时磁电弹性材料中含正4n边形孔边裂纹反平面问题的断裂性能,给出了纳米缺陷表面为磁电不可通条件下裂纹尖端断裂参数. Xiao等[11]研究了纳米缺陷表面为磁电不可通条件下磁电弹性材料含纳米椭圆形孔边双裂纹问题的Ⅲ型断裂力学分析并给出了纳米裂纹尖端磁电弹场强因子的封闭解. Guo等[12]研究了具有增强层的磁电弹性材料含纳米缺陷(椭圆孔或裂纹)问题的Ⅲ型断裂力学性能,给出了磁电弹场强因子的闭合解. Yang和Liu[13]研究了磁电弹性材料含纳米正三角形孔边裂纹反平面问题的断裂性能,分别给出了缺陷表面为磁电可通条件下和磁电不可通条件下裂纹尖端断裂参数. Xiao等[14]研究了缺陷表面为磁电不可通条件下磁电弹性材料含纳米圆形孔边周期裂纹问题的Ⅲ型断裂分析,给出了基体材料内部磁电弹场和裂纹尖端断裂参数.
目前,对于磁电弹性材料中含纳米尺度孔边任意位置贯穿裂纹问题尚未见有报道. 孔边任意位置裂纹问题的断裂分析是多缺陷强度问题的重要组成部分且更加普遍,相比于孔边轴向裂纹在数学上更加难以解决. 本文基于G-M理论和保角变换技术,研究磁电弹性材料中含纳米尺度圆孔边任意位置贯穿裂纹的反平面断裂力学问题. 获得了纳米缺陷的磁电弹场表达式,给出了磁电弹场强因子解析式,讨论了磁电弹场强因子随缺陷尺寸、裂纹位置、裂纹相互作用和施加载荷的变化规律.
图1表示考虑表面效应时磁电弹性材料(横观各向同性)中孔边任意位置贯穿裂纹示意图,远场作用机械载荷、电载荷和磁载荷. 纳米圆孔半径为R,贯穿裂纹沿圆孔径向,纳米裂纹1和2长度分别为Ll,纳米裂纹位置由α确定. 圆孔区域和基体区域分别用VcVm表示,纳米缺陷(孔洞与裂纹)表面用S表示,下标cm分别表示圆孔和基体. Oz轴为磁电弹材料的磁电极化方向.
问题的控制方程和物理方程如下[15-17]
其中表示广义位移,表示广义应力,其中w表示反平面位移,φ表示面内电势,ψ表示面内磁势,τyz表示反平面应力,Dj表示面内电位移,Bj表示面内磁感应强度.
利用复变弹性理论,磁电弹性材料含纳米尺度孔边任意位置贯穿裂纹的广义位移场和磁电弹场可以表示为[11,14]
其中表示解析函数向量,其中Fz)、Фz)、Θz)分别为反平面位移、面内电势、面内磁势的复函数表示形式.
假设纳米缺陷为磁电不可通条件,利用G-M[5-7]表面弹性理论,纳米孔边任意位置贯穿裂纹问题在界面上的非经典位移和应力边界条件如下[18]
其中tρθ)=ρeiθ表示缺陷表面上任意一点的极坐标,CS表示纳米缺陷(圆孔和贯穿裂纹)的表面磁电弹常数矩阵,且有:
将如图1所示物理平面(z平面)中纳米圆孔孔边任意贯穿裂纹圆孔外部区域保角映射到数学平面(ζ平面)中半径为R的圆外区域,其映射函数如下[19]
将解析函数向量在数学平面(ζ平面)内展开成洛朗级数形式[20]
经分析取有限项级数形式就可得到问题的闭合解:
其中是待定复常数矩阵.
基于远场载荷条件,由式(5)和(16)可得:
由磁电弹场公式(6)和纳米尺度位移和应力非经典表面边界公式(7)、(8),可得待定复常数矩阵之间的关系如下:
联立式(17)-(19),得:
由式(5)、(15)-(17)、(20)和(21),可得磁电弹性材料内的磁电弹场表达式:
其中E为三阶单位矩阵.
定义图1平面内裂纹尖端A点和F点的磁电弹场强因子如下[21]
其中:xy表示两个分量,z1=(R+L)eiαz2=(R+L)ei(α+π). 将式(22)代入式(23)和(24),可得:
其中:ω′(Reiα)=0和ω′(Rei(α+π))=0. 对式(25)和(26)使用洛必达法则,则纳米缺陷表面为磁电不可通条件下裂纹尖端AF磁电弹场强因子xy分量为:
定义无量纲磁电弹场强因子:
其中:L′=R+(L+l)/2表示等效裂纹长度,分别表示裂纹尖端AF的磁电弹场强因子xy分量.
(1)弹性材料含纳米孔边任意位置贯穿裂纹
κ11=0、μ11=0、e15=0、q15=0和α11=0时,式(27)退化为:
式(31)与文献[19]结果一致.
(2)磁电弹性材料含孔边任意位置贯穿裂纹
不考虑缺陷(孔和裂纹)的表面效应时,即CS=0,式(27)和(28)退化为:
式(32)和(33)表示磁电弹材料中宏观尺度孔边任意位置贯穿裂纹裂尖的磁电弹场强因子的解析解.
(3)磁电弹性材料含单个纳米孔边任意位置裂纹
令裂纹2长度l=0,式(27)退化为:
式(34)与文献[22]的结果一致.
(4)磁电弹性材料含纳米尺度孔边轴向对称贯穿裂纹
当裂纹位置α=0且令裂纹1和2长度相等,即:L=l,式(27)退化为:
式(35)与文献[11](a=b)和文献[14](n=2)的结果一致.
取复合材料BaTiO3-CoFe2O4为基体材料[23];纳米缺陷(孔洞和裂纹)的表面常数见表2[24].
图2表示无量纲磁电弹场强因子随纳米孔半径R的变化曲线,其中D=10-3C/m2B=10-2 N/Am,L/R=1,l/R=0.8,α=π/6. 图2(a)显示,随着孔洞半径R的增加且缺陷表面为压电表面时,无量纲应力强度因子y分量先增加后轻微减小和先减小后轻微增加,x分量先逐渐减小后轻微增加;缺陷表面为压磁表面时,逐渐增加,逐渐减小,逐渐减小. 随着R逐渐增大,无量纲应力强度因子趋于经典磁电弹解答. 从图2(b)看出,缺陷表面为压电表面时,无量纲电位移场强因子具有显著的尺寸效应,随着孔洞半径R的增加,y分量逐渐增加和逐渐减小,x分量都逐渐减小. 缺陷表面为压磁表面时,无量纲电位移场强因子xy分量迅速趋于经典磁电弹性理论解. 图2(c)表明,缺陷表面为压磁表面时,无量纲磁感应强度因子xy分量具有显著的尺寸效应. 随着孔半径R的增加,y分量逐渐增加和逐渐减小,x分量逐渐减小并趋于经典结果. 缺陷表面为压电表面时,无量纲磁感应强度因子xy分量与经典磁电弹性理论解一致.
图3表示无量纲磁电弹场强因子随纳米贯穿裂纹位置α的变化曲线,τ=4 MPa,B=10-2 N/Am,L/R=1,l/R=0.8,R=10 nm.
图3(a)可知,随着裂纹位置α从0增加至90°,无量纲应力强度因子y分量单调减小,先逐渐减小后增大. x分量先逐渐减小后增大,单调增加. 缺陷表面效应对无量纲应力强度因子xy分量的影响取决于纳米裂纹的位置. 图3(b)表明,随着α从0增加至90°且缺陷表面性质为压电时,无量纲电位移场强因子y分量单调增加,先逐渐增加后轻微减小. 无量纲电位移场强因子x分量先逐渐增加后轻微减小,单调减小. 缺陷表面性质为压磁时,单调减小,先逐渐减小后增加,先逐渐减小后增加,单调增加. 图3(c)表明,随着α从0增加至90°且缺陷表面性质为压电时,无量纲磁感应强度因子y分量单调减小,先减小后增加. 无量纲磁感应强度因子x分量先减小后增加,单调增加. 缺陷表面性质为压磁时,轻微增加,单调增加,单调增加,轻微减少. 图3表明,缺陷表面效应对无量纲磁电弹场强因子的影响受裂纹位置的制约.
图4给出了无量纲磁电弹场强因子随贯穿裂纹两侧裂纹长度比l/L的变化曲线,其中R=10 nm,L=10 nm,α=π/6.
图4(a)看出,随着l/L的增加,无量纲应力强度因子y分量逐渐减小,x分量轻微增加,先减小至最小值后轻微增加至稳定值. 图4(b)表明,随着l/L的增加且缺陷表面为压电表面时,无量纲电位移场强因子y分量缓慢减小,逐渐增加至稳定值. 而无量纲电位移场强因子x分量缓慢减小,逐渐减小至稳定值. 缺陷表面为压磁表面时,缓慢减小而轻微增加;逐渐减小至稳定值. 图4(c)表明,随着l/L的增加且缺陷表面为压电表面时,无量纲磁感应强度因子y分量逐渐减小至稳定值. x分量轻微增加,逐渐减小至最小值后轻微增加至稳定值. 缺陷表面为压磁表面时,缓慢减小,逐渐增加至稳定值;缓慢减小,逐渐减小至最小值后轻微增加.
图5给出了磁电弹场强因子随机械载荷的变化,其中R=30 nm,L/R=1,l/R=0.8,α=π/6. 图5(a)显示,随着机械载荷的增加且缺陷表面为压磁表面时,无量纲应力强度因子y分量迅速增加至稳定值,迅速减小至稳定值;x分量迅速减小至稳定值. 无量纲电位移场强因子几乎不变. 无量纲磁感应强度因子y分量线性减小和线性增加,x分量线性增加. 当缺陷表面为压电表面时,逐渐减小至稳定值,逐渐增加至稳定值,逐渐增加至稳定值;线性减小,呈线性增加;保持不变,即:无量纲磁感应强度因子在缺陷表面为压电时不受机械载荷的影响.
图6给出了无量纲磁电弹场强因子随电载荷的变化趋势,其中R=30 nm,L/R=1,l/R=0.8,α=π/6. 图6(a)表明,随着电载荷增加且缺陷表面性质为压磁时,无量纲应力强度因子几乎不变. 无量纲电位移场强因子y分量迅速减小至稳定值,快速增加至稳定值;x分量快速增加至稳定值. 无量纲磁感应强度因子y分量线性减小,而线性增加;x分量皆线性增加. 图6(b)显示,缺陷表面性质为压电时,无量纲应力强度因子线性增加,线性减小. 无量纲电位移场强因子逐渐增加至稳定值,逐渐减小至稳定值. 无量纲磁感应强度因子几乎不变,即缺陷为压电表面时屏蔽了电载荷对无量纲磁感应强度因子的影响.
图7表示无量纲磁电弹场强因子随磁载荷的变化趋势,其中R=30 nm,L/R=1,l/R=0.8,α=π/6. 图7(a)表明,随着磁载荷的增加且缺陷表面为压磁表面时,缺陷表面为压磁时会屏蔽磁载荷对应力强度因子和电位移场强因子的影响;而无量纲磁感应强度因子y分量逐渐增加至稳定值,逐渐减小至稳定值;x分量都逐渐减小至稳定值. 图7(b)显示,缺陷表面为压电表面时无量纲磁电弹场强因子保持不变,即:缺陷表面为压电时磁电弹场强因子不受磁载荷变化的影响.
本文基于G-M表面弹性理论和磁电弹性理论,研究了磁电不可通条件下磁电弹性材料含纳米孔边任意位置贯穿裂纹问题的III型断裂力学性能,给出了裂纹尖端磁电弹场和场强因子的解析表达式. 由于纳米缺陷(孔洞和裂纹)的表面效应,贯穿裂纹两端裂尖的磁电弹场强因子具有显著的尺寸效应且呈现出复杂的变化规律. 缺陷的表面效应对磁电弹场强因子的影响趋势受裂纹位置、缺陷表面性质(压电表面或压磁表面)、贯穿裂纹两端长度比值以及施加力电磁载荷的制约.
  • 河北省自然科学基金(A2022203025)
  • 河北省高等学校科学技术研究重点项目(ZD2021104)
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doi: 10.19636/j.cnki.cjsm42-1250/o3.2023.026
  • 接收时间:2023-06-15
  • 首发时间:2026-03-27
  • 出版时间:2024-02-25
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  • 收稿日期:2023-06-15
基金
河北省自然科学基金(A2022203025)
河北省高等学校科学技术研究重点项目(ZD2021104)
作者信息
    1燕山大学工程力学系,秦皇岛,066004
    2燕山大学河北省重型装备与大型结构力学可靠性重点实验室,秦皇岛,066004

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2种不同金属材料的力学参数

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种数
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species
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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