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Analysis And Optimization Of Structure Strength In Panel-type Furniture Based On ANSYS

Posted on:2009-07-28Degree:DoctorType:Dissertation
Country:ChinaCandidate:F M HeFull Text:PDF
GTID:1101360275966161Subject:Wood science and technology
Abstract/Summary:PDF Full Text Request
Panel-type funiture with simple structure is easy to be knock-down and transported. Mechanization,automation and collaboration are its production featuers.Its cost is lower and it is beneficial to protect forest reserves.Gradually,panel-type funiture becomes mainstream products in funiture market.But at present,panel-type funiture is designed experimentally and analogy,which is lack of exact analysis and accurate calculation.It usually leads to two results: on the one hand,the security of funiture is inadequate,it will deform serious or destroy before its life;on the other hand,its safety factor is too high,it will waste material,make the product oversized bulky,and decrease its artistic charm.This paper,based on FEM,ANSYS software and optimization,the structure,assemble forms and joint position were studied in theroy,computer simulation and experiment.Firstly,joint strength of corner was studied.The joint strength of L-type and T-type was studied.Effects of dowel diameter,two-in-one eccentric fittings and three-in-one eccentric fittings on joint strength in L-type were studied too.Effects of joint structure and assemble forms on joint strength were analyzed and verified by experiment.Secondly,optimization of panel-type funiture was reseached.The position and length of eccentric fittings were optimized, and the best values were got.At last,overall and local strength were analyzed by example of bookcase.Proposals to improve design were provided.The results were summarized as follows:1.To analyze structure strength of panel-type furniture by FEM theory and ANSYS software can avoid errors produced by simplified calculation and model distortion.Information such as stress distribution,stress level and strain is got easily,exactly and intuitively.The stress in component may calculate(it is very difficult by experiment).The stress and strain in any section can show easily by ANSYS software.We can evaluate strength according to any point,line or plane.It is good to design structure,to achieve the purpose of security and economy.At the same time,the results got by FEM analysis can be taken as the basis of optimization.2.The strain and stress distribution of L-type and T-type were got by analysis.Joint strength of L-type compared with T-type,it shows that the joint strength of T-type is higher than L-type,the value is 35%.The results of experiment verified the conclusion too.3.Analysis by effects of dowel diameter on joint strength,it shows that dowel diameter exerts a tremendous influence on joint strength.If the dowel diameter increases,the strain will decrease.The maximum stress below eccentric fittings and dowel is closer,the maximum stress in panel decrease too.We should stress rational dowel diameter. 4.Analysis by effects of two-in-one eccentric fittings and three-in-one eccentric fittings on joint strength in L-type,it shows that the joint strength of three-in-one eccentric fittings is higher than two-in-one eccentric fittings,the value is 44.91%.The results of experiment verified the conclusion too.5.The position and length of eccentric fittings were optimized by FEM theory and ANSYS software,and the best values were got.We found the best position and length of eccentric fittings,which can decrease stress concentration,improve security and lengthen production life.6.Analysis on overall strength of bookcase,the strain and stress were got.The strain and stress were analyzed comprehensive.We found stress concentration near supportings is very serious,so the supporting position was optimized.Proposals to improve design are provided by optimization.
Keywords/Search Tags:Panel-type furniture, Structure strength, FEM, ANSYS, Optimization
PDF Full Text Request
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