TY - JOUR
T1 - 水分-载荷耦合作用下 2D 编织复合材料的力学行为
AU - Cheng, Zhaohui
AU - Liu, Bin
AU - Xiang, Dong
AU - Xu, Fei
AU - Feng, Wei
N1 - Publisher Copyright:
© 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
PY - 2024/10
Y1 - 2024/10
N2 - In order to study the moisture absorption behavior and performance degradation law of 2D braided composites under long-term moisture-load coupling, a moisture-load coupled aging device was designed. The moisture absorption test and tensile test after moisture absorption of carbon fiber reinforced epoxy resin (T300/H69) plain woven composite material under different stress levels were carried out. The results show that the moisture absorption of T300/H69 braided composites is positively correlated with the tensile prestress, and increases with the increase of tensile prestress. Compared with the effect of water alone, the elastic modulus and strength degradation of the material under moisture-load coupling are more obvious. After 432 h at 140%σs (σs is yield stress) prestress, the elastic modulus and failure strength of the braided composites decreased by 55.9% and 35.4%, respectively. In addition, the degradation mechanism of braided composites under long-term moisture-load coupling is further revealed by macro and micro section analysis. Based on Shiva's residual strength theory, the residual strength model of composites under moisture-load is improved, and the prediction results are good, which provides guidance for the durability design of composites in complex environment.
AB - In order to study the moisture absorption behavior and performance degradation law of 2D braided composites under long-term moisture-load coupling, a moisture-load coupled aging device was designed. The moisture absorption test and tensile test after moisture absorption of carbon fiber reinforced epoxy resin (T300/H69) plain woven composite material under different stress levels were carried out. The results show that the moisture absorption of T300/H69 braided composites is positively correlated with the tensile prestress, and increases with the increase of tensile prestress. Compared with the effect of water alone, the elastic modulus and strength degradation of the material under moisture-load coupling are more obvious. After 432 h at 140%σs (σs is yield stress) prestress, the elastic modulus and failure strength of the braided composites decreased by 55.9% and 35.4%, respectively. In addition, the degradation mechanism of braided composites under long-term moisture-load coupling is further revealed by macro and micro section analysis. Based on Shiva's residual strength theory, the residual strength model of composites under moisture-load is improved, and the prediction results are good, which provides guidance for the durability design of composites in complex environment.
KW - 2D braided composites
KW - failure mechanism
KW - moisture absorption
KW - moisture-load coupling
KW - residual strength
UR - http://www.scopus.com/inward/record.url?scp=85208400210&partnerID=8YFLogxK
U2 - 10.13801/j.cnki.fhclxb.20240012.001
DO - 10.13801/j.cnki.fhclxb.20240012.001
M3 - 文章
AN - SCOPUS:85208400210
SN - 1000-3851
VL - 41
SP - 5283
EP - 5293
JO - Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
JF - Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
IS - 10
ER -