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管节点表面裂纹应力强度因子的研究   总被引:1,自引:0,他引:1  
唐新成  赖曾美 《实验力学》1996,11(2):170-179
本文分析了T、K、Y型管节点应力分布特征,在三维光弹试验结果验证的基础上,提出了适用于断裂力学方法应用的T、K、Y型管节点的应力强度因子(SIF)表达式。  相似文献
2.
求解了在材料的特征方程有重根时,三维压电弹性体的单位集中不连续位移和不连续电势基本解。讨论了重根对断裂力学问题解的影响。  相似文献
3.
本文由Reissner型板的不连续位移基本解,根据Betti互换定理,导出了Reissuer型板的不连续位移边界积分方程;结合平面问题的不连续位移边界积分方程─—边界元方法和线弹簧模型,给出了Rrissner型板表面裂纹应力强度因子的线弹簧-不连续位移边界积分方程解法。  相似文献
4.
IntroductionTheclassicalconhnuummechanicshasbeenusedtosolvemanyproblemsinmacrofracturemechanics,butencountersdifficulheswhentheeffectofITilcrocharacteristicdimensionshouldbetakenintoaccount.Thestressfieldverynearthecracktipisstillnotclear.Somephenomenaofshortcrackscannotbeexplained["']andsomemechanismoffracturehasnotbeensolvedyet.Thenon-localelashcitytheoryseemsattractivetotheseproblems.Thetheoryofnon-localelasticity,establishedanddevelopedbyEringenetal[3),connectstheclassicalcontinuummechan…  相似文献
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ntroductionThetheoreticalframeofnon_localelasticityhasbensetup[1,2].Manyimportantresultshavebengotbyusingnon_localtheorytosol...  相似文献
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Based on the extended Stroh formalism, we first derive the extended Green’s functions for an extended dislocation and displacement discontinuity located at the interface of a piezoelectric bi-material. These include Green’s functions of the extended dislocation, displacement discontinuities within a finite interval and the concentrated displacement discontinuities, all on the interface. The Green’s functions are then applied to obtain the integro-differential equation governing the interfacial crack. To eliminate the oscillating singularities associated with the delta function in the Green’s functions, we represent the delta function in terms of the Gaussian distribution function. In so doing, the integro-differential equation is reduced to a standard integral equation for the interfacial crack problem in piezoelectric bi-material with the extended displacement discontinuities being the unknowns. A simple numerical approach is also proposed to solve the integral equation for the displacement discontinuities, along with the asymptotic expressions of the extended intensity factors and J-integral in terms of the discontinuities near the crack tip. In numerical examples, the effect of the Gaussian parameter on the numerical results is discussed, and the influence of different extended loadings on the interfacial crack behaviors is further investigated.  相似文献
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