PVC frame cutting process by guillotine is a common method that attracted attention of car parts and PVC decorating furniture producers. In this paper, the effects of main parameters such as cutting speed, lubricants and cutting frame holder pressure force on PVC frame section surface smoothness is investigated by experimental methods on a specified PVC frame sample and then by FEM simulation using ABAQUS 6.8 software. The results obtained by experimental methods and software simulation show intense effect of these parameters on the PVC frame section surface smoothness and cutting force. Finally, based on the experimental works, some solutions are suggested to improve the cutting quality. Manuscript profile

Modeling of crack propagation by a finite element method under mixed mode conditions is of prime importance in the fracture mechanics. This article describes an application of finite element method to the analysis of mixed mode crack growth in linear elastic fracture mechanics. Crack - growth process is simulated by an incremental crack-extension analysis based on the maximum principal stress criterion which is expressed in terms of the stress intensity factor. In this paper a procedure is employed to correct direction of crack propagation to ensure that a unique final crack path is achieved for different analysis of a problem by using different increments of crack. For each increment of crack extension, finite element method is applied to perform a single - region stress analysis of the cracked structure. Results of this incremental crack – extension analysis are presented for several geometries. Manuscript profile

Up to now a large number of models have been developed to measure or predict the damage in equipments. Some of these models have been implemented in ABAQUS software. To implement damage parameters in the software, it is necessary to perform complex and expensive practical tests. One of these damage models is Forming Limit Diagram (FLD).The purpose of this research is deriving required parameters for modeling damage by numerical method and using of software. To study and compare of the accuracy of this method, these parameters have been derived with experimental method. FLD parameters for metastable austenitic stainless steel 304 have been extracted from Erichsen test and then phase change from austenite to martensite during deep drawing have been modeled with CLEMEX and SIGMAPLOT software. By defining changes of physical and mechanical properties of elastic-plastic material, the obtained results are transmitted to ABAQUS via developing a VUMAT subroutine in FORTRAN. Then Erichsen test has been simulated in ABAQUS and aforementioned subroutine was used to define changes of properties in simulation. Critical points susceptible for necking in all test cups are determined and numerical FLD was drawn based on principal strains in these points. Finally, the results of this method and practical tests were compared Manuscript profile