Study On Mechanical Properties And Failure Mechanism Of Fabricated Enclosure Of PE

Polyethylene(PE)wood plastic composite(WPC)fabricated enclosure structure features excellent characteristics such as high strength,easy loading and unloading,long service life,and environmental protection in comparison to the traditional enclosure structure,which is primarily applied in Guangdong province and other areas with strong winds.The enclosure structure made of such a new material has been put into production and use to a limited extent.Nevertheless,the security and applicability of the enclosure structure are still unknown.Hence,studying the mechanical property and the failure mechanism of the PE-WPC enclosure structure would be significant.This paper has been prepared against the above background and supported with experiments.To be specific,the mechanical property of the PE-WPC enclosure structure was analyzed through numerical simulation before optimally improving the structure based on its load-bearing characteristics.On this basis,a comprehensive conclusion was made to provide a theoretical support for the application and promotion of the PE-WPC enclosure structure.First of all,the mechanical property of PE-WPC material was tested through the tensile test at different temperatures.A stress-strain curve was plotted in accordance with material properties,such as tensile strength,and poisson ratio obtained from the experiment.The experimental result shows that the tensile strength of the material is gradually decreased,and the strain corresponding to the peak stress is also gradually decreased with the rising temperature.Next,mechanical properties of columns and plates were analyzed respectively,through the column flange failure test,the column four-point bend test and the plate four-point bend test.After that,a four-point bend test model was established for columns and plates using the ABAQUS,the finite element analysis software.And the result obtained by ABAQUS was compared with the test result,validating the accuracy of the finite element model.And then,the overall mechanical property of the PE-WPC enclosure structure was analyzed via the theoretical,experimental and finite element analysis.The maximum bearing capacity of the structure under the effect of wind load was studied based on the stress-strain level of columns and plates.Meanwhile,the failure mode of the enclosure structure was speculated according to the stress concentration area of columns and plates.The result shows that the enclosure structure can withstand whole gale and storm,respectively,under unsupported and supported conditions at the normal temperature,whereas its bearing capacity is declined with the rising temperature.At last,the column cross-section was analyzed optimally with the finite element analysis software based on the results obtained by the test and the finite element analysis.Meanwhile,two column cross-section optimization schemes were established.And the property analysis of the enclosure structure was conducted on the two schemes.The finding shows that both of the two schemes can contribute to enhancing the property of the enclosure structure.