The Failure Analysis And Experimental Research For Aeronautical Composite Based On Puck Criterion

Compared with the traditional metal materials,advanced composite materials has more advantages from the overall performance,its amount ratio has become an important symbol of aerospace advanced.However,due to the the anisotropy of the material and the damage mechanism complexity,there is a deficiency in the accuracy of the composite material failure analysis.In view of the above problems,this paper applies Puck’s criterion to the simulation analysis program,and based on this,have carried out the failure analysis and experimental research for fiber reinforced composites.The main research results are as follows:1)The basic principles of Puck’s criterion and its math equations systematically was given;Two subroutines using the computer language Fortran and Python and write the Puck criterion into the finite element analysis software Abaqus for analyzing the failure behavior of composite laminates were written.They are user-defined material variables(Usdfld),which are manually input material parameters,custom field variable subroutines(Umat)with linear degenerative failure modes,and nonlinear degenerative damage mechanics based on constitutive equations.2)The three-dimensional finite element analysis model of single-hole laminate was established,use Umat and Usdfld programs analyze the uniaxial compression force failure.The results show: the Umat calculation accuracy is high based on Usdfld program,the error is only 2.3%.The program Usdfld is calculated approximately 14% faster than the Umat program,and the error rate and elapsed time are reduced compared to the Hashin failure criterion in the software.3)The uniaxial destructive experiment of the composite laminates were designed and completed,which verifies the validity of the program.The experimental data are compared with the finite element simulation results based on Puck criterion,the results of the finite element analysis are in good agreement with the experimental ones,and the overall error is about 10%.It is shown that the paper’s method has good prediction accuracy,it can reflect the real mechanical behavior and failure mode of the reaction material structure.Analyzed the resources which may cause error,including test defects,the experimental environment(temperature,humidity),the specimen and the chuck friction.Aiming at the above sources of error,we propose some improvements and solutions.