CAJ | 학술논문

为研究SiC/Ti-6AL-4V纤维增强钛基复合材料在横向拉伸载荷下的力学特性，建立了三维细观有限元模型；利用ANSYS软件接触单元和内聚力材料模型，对其制备残余热应力及横向拉伸载荷下的界面脱粘、基体失效进行了数值模拟。结果表明：考虑界面材料属性的细观力学有限元单胞模型，可较好地模拟纤维增强钛基复合材料在横向拉伸载荷下的界面脱粘、基体失效；横向拉伸载荷下，复合材料基体细观结构内部应力分布不均导致基体材料利用率下降，是造成复合材料横向强度低于基体材料强度的主要原因。
위연구SiC/Ti-6AL-4V섬유증강태기복합재료재횡향랍신재하하적역학특성，건립료삼유세관유한원모형；이용ANSYS연건접촉단원화내취력재료모형，대기제비잔여열응력급횡향랍신재하하적계면탈점、기체실효진행료수치모의。결과표명：고필계면재료속성적세관역학유한원단포모형，가교호지모의섬유증강태기복합재료재횡향랍신재하하적계면탈점、기체실효；횡향랍신재하하，복합재료기체세관결구내부응력분포불균도치기체재료이용솔하강，시조성복합재료횡향강도저우기체재료강도적주요원인。
A 3D micro-mechanical model has been established to investigate the transverse properties of SiC/Ti-6AL-4V reinforced TMC subjected to both thermal residual stress and applied transverse stress. A numerical simulation of interface debonding and matrix failure was performed by means of contact element with CZM (Cohesive Zone Material) model of ANSYS software. The results indicate that finite element analy-sis of micro-structure agrees well with the failure modes. The reduction of material utilization caused by variant stress distribution in TMC is the main reason resulting in lower transverse strength than matrix strength.