个人信息:
陈普会
招生学科专业:
航空宇航科学与技术 -- 【招收博士、硕士研究生】 -- 航空学院
机械 -- 【招收博士、硕士研究生】 -- 航空学院
学位:工学博士学位

个人信息: Personal information

学历:南京航空航天大学 所在单位:航空学院

A simple procedure for the determination of the cohesive law in 4-ENF test with consideration of the friction and R-curve effect

点击次数: 所属单位:航空学院 发表刊物:Eng. Fract. Mech. 摘要:The measurement of initiation and propagation fracture toughness is important for characterizing the delamination behavior of composite laminates, especially in the case with distinct R-curve behavior which can be caused by fiber bridging, shear deformation of matrix, etc. Four-Point End Notched Flexure (4-ENF) is one of the widely adopted tests to measure the mode II toughness values, while the friction between the crack surfaces may have a significant impact on the results. In this paper, a simple procedure to determine the cohesive law in 4-ENF test with consideration of the friction and R-curve effect is proposed. Firstly, determining the equivalent crack advance according to the compliance variation of the specimen is performed, without the need for monitoring the crack length during the test. Next, the Energy Release Rate in mode II (GII) and crack sliding displacement (δt) are derived based on the point-friction assumption and beam theory. Finally, the cohesive law is obtained via the J-integral approach. To obtain suitable values of the penalty stiffness and interface strength, the influence of these parameters on the prediction of 4-ENF test is studied. Comparisons of the numerical results and the experimental data show a good correlation. The effect of variation of friction coefficients on derived cohesive stress and initiate energy release rate is discussed as well. © 2019 ISSN号:0013-7944 是否译文: 发表时间:2019-01-01 第一作者:陈普会 通讯作者:,,陈普会,陈普会,陈普会,陈普会,陈普会,陈普会,陈普会,陈普会,陈普会,陈普会 其他作者:Liu, Weiling