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根据Eshelby积分的守恒性,把二维问题里Rice定义的J积分推广到三维问题。定义了三维问题的J积分,叙述并证明其主要性质和在线性断裂力学三维问题中的初步应用。 相似文献
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Althoughtheconstrainedtwistproblemsofthin_wallstraightbarsofisotropicand/oranisotropicmaterials,withclosedoropencross_sections,havebeenwellsolved[1~3],forspatialcurvedbarsofthistypeofproblemstherehasnotbeenanysatisfactorysolutionuptonow.Thisproblemis… 相似文献
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钨合金中钾的掺杂会引入大量的缺陷,如尺寸几十纳米的钾泡、高密度的位错以及微米量级的晶粒带来的晶界等,这些缺陷的浓度和分布直接影响合金的服役性能.本文运用正电子湮没谱学方法研究钾掺杂钨合金中的缺陷信息,首先模拟计算了合金中各种缺陷的正电子湮没寿命,发现钾的嵌入对空位团、位错、晶界等缺陷的寿命影响很小;然后测量了不同钾含量掺杂钨合金样品的正电子湮没寿命谱,建立三态捕获模型,发现样品中有高的位错密度和低的空位团簇浓度,验证了钾对位错的钉扎作用,阐述了在钾泡形成初期是钾元素与空位团簇结合并逐渐长大的过程;最后使用慢正电子多普勒展宽谱技术表征了样品中缺陷随深度的均匀分布和大量存在,通过扩散长度的比较肯定了钾泡、晶界等缺陷的存在. 相似文献
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张培源 《应用数学和力学(英文版)》1982,3(1):127-133
J-integral defined by Rice depends on the constitutive relation of mediums. In the present paper, a conservative integral independent of the constitutive relation of mediums is defined in order to extend Rice’s definition of the J-integral which depends on the constitutive relation. Its main properties which are similar to those of the prevailing J-integral are proved. In the case of the elastic mediums, the extensive conservative integral is the same with Rice’s J-integral. 相似文献
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Rice定义的J积分受介质本构关系的限制.本文对J积分的Rice定义加以推广,提出不受介质本构关系限制的守恒积分,并证明其具有通常J积分的性质.在弹性介质情况下,这种推广的守恒积分就是Rice定义的J积分. 相似文献
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Based on composite materials,the equivalent elastic-plastic constitutive equations ofmultiphase solid are researched.According to the suggested definition of.constitutiveequivalence it is demonstrated that the multiphase solid,composed of several kinds ofhomogeneous elastic-plastic media that conform to the generalized normality rule,has thesame type of constitutive equations as its constituents have that also conform to thegeneralized normality rule. 相似文献
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