Experimental Big Plate Application Structure Design And Performance Analysis

Shelter is a workplace which means to provide a suitable working environment for staff and equipment,and to facilitate the implement of handling and transporting in various ways.It is made of several composite sandwich panels,and the structure of which is complex;besides,the differences among material properties of each structure is obvious,and the analysis of mechanical properties is complex.Shelter is always used for wild field operations in relatively harsh operating conditions.The load conditions for shelters are complex,and sometimes bubbling and debonding are avoidable,although it rarely occurs.But in case of it,the maintaining,which will make some negative impact on the quality of the product and its appearance,is very difficult.Through some relevant literature review,it is said that the bubbling and debonding problem of the shelter is an industry problem.The analysis for the causes of bubbling,debonding,and to improve the shelter's quality,it is important to find certain solutions to the problems.This thesis makes a study about the composite-plate-shelter in thermodynamics.Firstly,through a study in accordance with the existing board design drawings and existing literature,this thesis proposes several finite element modeling programs.Through a comparison among these modelings and results,it will choose a reasonable modeling program,set up a finite element thermal compound-structure coupling model for the composite-shelter,and apply the same experimental temperature load.According to the comparison between calculation results and experimental results,the former is in good agreement with the latter.Considering the complexity of the entire shelter,a reasonable simplification is necessary.Without regard to the changes of material properties in the shelter skeleton weld,this thesis treat the material properties of the weld and material properties of adjacent structural as the same;also,skin and sandwich are hypothesized to be linear elastic material;the entire shelter deformation is in small deformation;the contact surface of skin and polyurethane foam is pasted firmly,without sliding,and with the same deformation.Based on a large plate modeling program,this thesis is to further establish the finite element model for the entire shelter,to make an analysis about the thermal-structural coupling,to study the stress and deformation of structure under different conditions load,and to identify the reasons that cause debonding and bumping.At the same time,this thesis is going to introduce the basic theory of kinetic analysis,and make a stimulation analysis of the shelter.Through the stimulation analysis,it will get the shelter's own five natural frequencies,and lay a foundation for the design and a further kinetic analysis.In some literature,it studies about the impact of bubbling foam defects on skin,bubbling and debonding.In allusion to these studies,this thesis is going to analyze the phenomenon and reasons of bubbling,to establish a foam defect analysis model,and to discuss the effects of different sizes of bubbles on the bond stress.The thesis will propose some corresponding modification measures by an analysis of the production process and structural design.