热压罐成型典型制造缺陷对复合材料的力学性能影响研究

Study on Influence of Typical Manufacturing Defects in Autoclave Forming on Mechanical Properties of Composite

利用热压罐成型制备了含有不同参数的面外褶皱试验件和分层试验件,分别对试验件进行拉伸、压缩、短梁剪切和三点弯曲试验,并对试验后样件的断裂形貌进行观察分析,探究了面外褶皱和分层对复合材料综合力学性能的影响和破坏机理。结果表明,面外褶皱使复合材料的拉伸强度、压缩强度、层间剪切强度和抗弯强度分别至多下降了约47%、77%、23%和49%,且面外褶皱的起皱层数对力学性能的影响要比尺寸显著;分层会使复合材料的压缩强度、层间剪切强度和抗弯强度分别至多下降了24%、38%和15%,而对拉伸强度的影响不大。

By exploring the out-of-plane wrinkles and delamination defects easily generated during the autoclave forming process,out-of-plane wrinkle test pieces with different sizes and wrinkle layers and delamination test pieces with various sizes are prepared.Tensile,compression,short beam shear and three-point bending tests are carried out on the test pieces.Then the failure morphologies of the test pieces under test are compared and analyzed to explore the effects of outof-plane wrinkles and delamination on the comprehensive mechanical properties of the composites and failure mechanism.The results show that the tensile strength,compressive strength,interlaminar shear strength and flexural strength of the composites with out-of-plane wrinkles respectively decline by 47%,77%,23%and 49%,and the number of wrinkled layers of out-of-plane wrinkles has a more significant effect on the mechanical properties than the size;delamination can cause a significant decrease in the compressive strength,interlaminar shear strength and flexural strength of the composites which respectively decline by 24%,38%and 15%,while it has little effect on the tensile strength.