光粘弹性——粘弹性应力分析的一个实验方法

卡尔-汉斯·雷曼

光粘弹性——粘弹性应力分析的一个实验方法

卡尔-汉斯·雷曼

德意志联邦共和国柏基切-乌泊特大学

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出版历程
- 收稿日期: 1986-03-11
- 刊出日期: 1987-11-15

Photoviscoelasticity-an Experimental Method in Viscoelastic Stress Analysis

Karl-Hans Laermann

Bcrgischc Univcrsital-Gesamthochschtile Wuppertal, West Germany

摘要

摘要: 本文对粘弹性应力分析的光粘弹性实验方法进行了全面的讨论。指出排除试件的收缩和老化效应很重要。为此,在试验开始前,将材料加温至60℃且保温三天是个好经验。测量时应有恒温器保持恒温。并指出除了在轴对称问题以外,用实验测定折射张量的主轴(随时间变化的)还有困难。在逐步加载的精确测量中避免动力效应,必须将每一阶段的测量时间限在一秒钟内完成。

Abstract: In this paper,the photoviscoelasticity method of viscoelastic stress analysis has been discussed in detail.lt is shown that,in order to avoid the effects of shrinkage andaging in the test specimens,it is suggested that the specimens should be tempered for three days at a temperature of 60℃ before starting the experiments,and the temperature filtering arrangement is recommended in the experimental setups to keep the temperature absolutely constant.Besides the axi-symmetrical time-dependent stress state,the determination of the principle axes of the refraction tensor experimentally remains an unsufficiently solved problem.To avoid dynamic effect in the step wise loading,the time of measurement in every step should be limited in about one secend.

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参考文献(14)

[1]	Mindlin,R.D.,A mathematical theory of photo-viscoelasticity,J.of appl.Physics,20,2(1949).
[2]	Pindera,J.T.,Remarks of properties of photoviscoelastic model materials,Exp.Mechanics 6(1966).
[3]	Dill,E.H.,Photoviscoelasticity,Proc.Fourth Symp.on Naval Structural Mechanics,Mechanics and Chemistry of Solid Propellants,Pergamon Press(1965).
[4]	Dill,E.H.,Photoviscoelasticity J.Kestens(editor):The photoelastic Effect and Its Applications Springer-Verlag(1975).
[5]	Dill,E.H.and C.Fowlkes,Photoviscoelastic Experiments,The Trend in Engineering,7,(1964).
[6]	Coleman,B.D.and E.H.Dill,Theory of induced birefringence in materials with memory,J.Mech.Phys.Solids,19(1971).
[7]	Coleman,B.D.and E.H.Dill,Photoviscoelasticity:theory and practice,J.Kestens(editor):The Photoelastic Effect and Its Applications,Springer-Verlag(1975).
[8]	Katona,M.G.,Combo viscoplasticity:an introduction with incremental formulation,Computers and Structures,11,(1980).
[9]	Bakic,A.,Uber die rechnerische und experimentelle Bestimmung des Spannungszustandes in elastisch gebetteten Scheiben unter Berücksichtigung viskoelastischen Materialverhaltens,Diss.Berg.Universität GH Wuppertal(1984).
[10]	Frocht,H.M.,Photoelasticity,Vol.1 and 2,John Wiley & Sons,Inc.(1949),(1948).
[11]	Laermann,K.-H.,Rekonstruktion innerer Verformungs-und Spannungszustände aus experimentell bestimmten Oberflächenverformungen,VDI-Berichte Nr.514 VDI-Verlag Düsseldorf(1984).
[12]	Laermann,K.-H.,Problems in Application of Photoviscoelasticity in Practical Experimental Stress Analysis,Berichte:Labor für Experimentelle Spannungsanalyse und Me Btechnik,Berg.Univ:GH Wuppertal(1984).
[13]	Weber,H.,Formulierung rheo-optischer Gesetze und deren Anwendung zur experimentellen Analyse ebener Spannungs-und Deformations-zustände in Kunststoffbauteilen,DEG-Forschungsbericht(1981).
[14]	Theocaris,P.S.,A review of the rheo-optical properties of linear high polymers,exper.Mech.,5(1965).