细片层珠光体团的塑性响应特性

An Investigation to the Plastic Characteristics of Thin Laminar Pearlitic Colony

细片层珠光体团是由铁素体片和渗碳体片交替叠合而成的复相材料。在小片层间距和各相材料均为弹塑性的假设下，采用有限元方法分析了垂直于片层方向上的材料响应特性及层厚的影响，并用非经典塑性理论推导了珠光体团的弹塑性本构方程。对不同加载方向上珠光体团的响应特性和循环蠕变特性进行了分析。可作为进一步研究珠光体材料的宏观响应特性。

Thin laminar pearlitic colony is the element of a kind of two phase materials,which is composed of the thin lamellas of ferrite and cementite one over the other. With the assumption of small thickness of lamella and small deformation as well as that both phases are elastoplastic, an elastoplastic constitutive description for the pearlitic colony is obtained based on non classical theory of plasticity. The constitutive behavior in different direction and along non proportional path is analyzed. The finite element approach is also used to analyze the influences of the thickness of lamella on the material response. Satisfactory agreement is found between the results obtained by the two methods, which demonstrates the validity of the proposed model.