Development Of Simulation And Analysis System Of Single Fibre Pull-Out Test Based On VC++ And ANSYS

Single fibre pull-out test is one of the important ways to study the properties of fiber-reinforced composites'interface. However, it needs a large number of test samples which are produced very complexly, which impacts the practical application of the test. The experimental and computational researches for the single fiber pull-out test simulation have been carried out with the use of computer software technology and FEA (Finite Element Analysis) method, and the software named simulation and analysis system of single fibre pull-out test has been developed in this article. The results show that the data from simulation are consonant with the actual tests'performance parameters, such as interface shear strength and fibre critical length, and the process of the interface debonding is found.Firstly, on the basis of the theory of single fibre pull-out test of fiber-reinforced composites, mechanical analysis model of the test has been established in the article. The application of ANSYS software and its APDL (Parametric Design Language) has helped to realize the FEA about the test and the methods for building the sample of a single fibre pull-out test for resin matrix have been studied.Secondly, for aramid fiber reinforced bisphenol A epoxy resin composite, the ANSYS simulations and applications of single fiber pull-out test have been implemented respectively. The results from both methods are consonant. Among them, the average interfacial shear strength calculated from FEA is consonant with one from the actual tests with only a difference of 4.5%. So the forecast has proved accuracy of the simulation and rationality of FEA model, and the simulation's guiding role for the actual tests has achieved. The process of interfacial debonding, which is in line with the actual interface behavior in the tests, has been showed in the simulation.Thirdly, the researches on the ANSYS software re-development technologies—APDL, UIDL and UPFs—which are embedded in the ANSYS software, have shown their advantages and disadvantages respectively. But APDL lacks visualization; UIDL's interactive features are not strong enough and it has not post-processing function; UPFs may have a destructive impact on ANSYS system. So, with the help of Visual C++ 6.0 development platform, a high degree of visualization of ANSYS re-development technology has been developed to solve problems, such as interface technology between ANSYS software and VC++, and how to determine the end of ANSYS software operation. The simulation method with a high visualization has achieved.Fourthly, on the basis of the ANSYS software re-development technology and interface programming technology, database technology and ADO technology based on VC++, the simulation and analysis system software of single fiber pull-out test has been designed and developed. The system has the clear interface management, powerful performance of human-computer interaction and data post-processing function to directly calculate the final results of the tests after inputting the basic parameters of them.The actual tests have shown that the FEA model of a single fiber pull-out test in the article is accurate and reliable; the simulation method in the calculation of fiber-reinforced composite materials'interface strength and fiber critical length and in the simulation of the process of interface debonding is available and workable. At the same time, based on VC++, a new ANSYS software re-development technology with high visualization has been invented to develop the simulation and analysis system software of a single fibre pull-out test. This system can gain qualitative and quantitative conclusions about the tests before they will be carried out, so it can help to simplify the cumbersome process of tests to improve the experimental efficiency and the accuracy of each test and reduce the experimental cost with a certain practical application value.