scholarly journals Determination of Dynamic Stress in Fibre Reinforced Materials under Impact Load

1998 ◽  
Vol 5 (4) ◽  
pp. 267-272
Author(s):  
D.H. Müller ◽  
Th. Franz ◽  
A. Tenzler
Keyword(s):  
Experimental Data ◽  
Anisotropic Material ◽  
Dynamic Stress ◽  
Impact Load ◽  
Damage Threshold ◽  
Stress Concentrations ◽  
Reinforced Plastics ◽  
Experimental Part ◽  
Potential Value

The investigations reported in this paper are intended to obtain knowledge about stress concentrations within fibre reinforced plastics due to impact loadings below the damage threshold of the anisotropic material. The paper focuses on presenting the application of a dynamic photoelastic technique more than on providing extensive and detailed experimental data. Thus, a brief summary of the experimental part is given. The potential value of the developed experimental method is demonstrated exemplary for an arbitrary composite.

Determination of the Duration of Memory for Viscoelastic Materials

1970 ◽  
Vol 37 (2) ◽  
pp. 449-453 ◽  
Author(s):  
M. H. Gradowczyk ◽  
J. Soussou ◽  
F. Moavenzadeh
Keyword(s):  
Experimental Data ◽  
Anisotropic Material ◽  
Finite Interval ◽  
Computing Time ◽  
Three Dimensional ◽  
Viscoelastic Materials ◽  
One Dimensional

The possibility of limiting the memory of nonlinear nonaging viscoelastic materials is discussed. If the deformation histories are bounded, then the memory interval −∞ < τ ≤ t can be reduced to the finite interval t −d ≤ τ, where d ≥ 0 is the duration of memory. It is shown how the duration in relaxation and creep can be obtained for one-dimensional motions. As an application the duration of memory in relaxation and creep of solid polyurethane is computed from available experimental data. It is also shown that when the functionals are evaluated numerically, the use of the duration reduces significantly the computing time. The case of anisotropic material in three-dimensional motions is also discussed.

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