A CONTINUUM MODEL FOR VOID NUCLEATION BY INCLUSION DEBONDING
A CONTINUUM MODEL FOR VOID NUCLEATION BY INCLUSION DEBONDING
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DOI：
10.1115/1.3173064
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发表时间：
1987-09-01
影响因子：
2.6
通讯作者：
NEEDLEMAN, A
中科院分区：
文献类型：
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作者：
NEEDLEMAN, A
一个内聚区模型，充分考虑有限的几何形状的变化，是用来提供一个统一的框架来描述从初始脱粘通过完全脱粘的空隙成核的过程。分析了在各向同性硬化弹粘塑性基体中模拟周期排列刚性球形夹杂的边值问题。尺寸考虑将特征长度引入到配方中，并且取决于该特征长度与夹杂物半径的比率，以“延性”或“脆性”方式发生脱粘。的三轴性的所施加的应力状态对成核的影响进行了研究，数值结果与描述的空穴成核的现象学的本构框架内逐步空化固体。
A cohesive zone model, taking full account of finite geometry changes, is used to provide a unified framework for describing the process of void nucleation from initial debonding through complete decohesion. A boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardening elastic-viscoplastic matrix is analyzed. Dimensional considerations introduce a characteristic length into the formulation and, depending on the ratio of this characteristic length to the inclusion radius, decohesion occurs either in a “ductile” or “brittle” manner. The effect of the triaxiality of the imposed stress state on nucleation is studied and the numerical results are related to the description of void nucleation within a phenomenological constitutive framework for progressively cavitating solids.