Static Tensile Properties and Engineering Estimation Model of Porous Laminates Under Hygrothermal Environment
The prediction of mechanical properties of composite structural parts in hygrothermal environment is of great significance for its engineering applications.Focusing on the prediction of static tensile properties and strength of composite laminates in hygrothermal environments,the static tensile test of porous laminates of composite materials was carried out,and the failure response and damage characterization of six different types of structures in hygrothermal environments were analyzed.Based on the stress field strength method,the engineering estimation model of porous laminates in hygrothermal environment was established,and the influence of hygrothermal environment on the mechanical properties and tensile failure of porous laminates was analyzed by comparing the finite element progressive damage model and test results.The results show that the error range between the prediction results of the engineering estimation model,finite element and test results is small,which can be used to predict the influence of temperature and hygroscopic rate on the tensile failure strength of porous laminates.Compared with the dry state at room temperature,the tensile failure strength of the specimen is decreased by 6.1%in the hygroscopic saturation state at 75℃.In the dry state of 25℃ and 75℃ hygroscopic saturation,the fiber tensile failure of 0°padding of porous laminate is the most serious,the tensile failure of the matrix of 90°ply is the most serious,and the main failure modes of laminate are matrix tensile failure and fiber tensile failure.The microscopic morphology of the thickness of the laminate in the hygroscopic saturation state at 75℃ was analyzed by scanning electron microscopy,and it is found that the debonding degree of fiber and resin in the 0°direction of the specimen is aggravated and obvious cracks appear,and the fiber distribution in the 90° direction is more neat,but there are fewer adherents.
compositehygrothermal environmentlaminatesmechanical propertiesengineering estimation model
NETL
NSTL
万方数据
