Download Mechanical Behavior of Materials under Dynamic Loads: by Markus Reiner (auth.), Ulric S. Lindholm (eds.) PDF

By Markus Reiner (auth.), Ulric S. Lindholm (eds.)

An enough actual and mathematical description of fabric be­ havior is uncomplicated to all engineering functions. thankfully, many prob­ lems can be handled completely in the framework of elastic fabric reaction. whereas even those difficulties may possibly turn into yuite advanced be­ explanation for geometrical and loading stipulations, the linearity, reversibility, and cost independence mostly appropriate to elastic fabric descrip­ tion definitely eases the duty of the analyst. this present day, notwithstanding, we're in­ creasingly faced with functional difficulties which contain fabric reaction that is inelastic, hysteretic and price based mixed with loading that is brief in nature. those difficulties comprise, for example, structural reaction to relocating or impulsive a lot, all of the components of ballistics (internal, exterior and terminal), touch stresses lower than excessive velocity bearings, excessive velocity machining, rolling and different steel operating tactics, explosive and impression forming, surprise attenuation buildings, seismic wave propagation, and so forth of equivalent im­ portance. As those difficulties have been encountered, it turned more and more obvious that we didn't have handy the actual or mathematical description of the habit of fabrics essential to produce real looking suggestions. therefore, over the past ten years fairly, there was enormous attempt expended towards the new release of either experi­ psychological facts at the dynamic mechanical reaction of fabrics in addition to the formula of sensible constitutive theories. It used to be the aim of the Symposium at which the articles during this ebook have been offered to debate and evaluation fresh advancements during this field.

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Additional info for Mechanical Behavior of Materials under Dynamic Loads: Symposium Held in San Antonio, Texas, September 6-8, 1967

Example text

5) and then subjected to an impact with the spring the same compression as the data in Table I. = x= 10 In -;: 200 ::l.. ,. sec) Fig. 5. Strain histories in specimens never previously deformed in the plastic rang-e when subjected to a small impact force. (;auges at x = 12 in. and x = 14 in. remain elastic while the approximate permanent strains at the other positions are: 240. /in. at x = 4, 6. 8 and lOin. respectively. 32 Oscar W. Dillon,jr. Very Small Impacts The writer has shown [7] that data obtained in large impacts are not sensitive to the difference between smooth stress-strain relations and a relation such as that represented by Fig.

S. Army BRL Contract No. DA-36-03421X4992, 509-0RD-3104RD, The Johns Hopkins University (1961). 17. G. L. , Proc. Symposium on Structural Dynamics Under High Impulsive Loading, 147 (1963). 18. W. F. D. Dissertation, The Johns Hopkins University (1967). 19. J. F. Bell and W. M. Werner, J. App!. , 33,2416 (1962). PLASTIC DEFORMATION WAVES AND HEAT GENERATED NEAR THE YIELD POINT OF ANNEALED ALUMINUM OSCAR W. DILLON, JR. y Lexington, Kentucky ABSTRACT Experimental data on the propagation of deformation "'ayes and the heat generated during the plastic deformation of annealed aluminum are presented.

960 -7- 5) and that this strain is constant at this value for significant time intervals. Therefore 40 Oscar W. Dillon,jr. 1600 1200 c: ...... 6 ::l. ~ 1 SPECIMEN « a::: 1~2 -8 ..... 6 In 100 200 300 400 TIME (fL sec) Fig. 10. Strain histories in a multi-section composite specimen when the spring is compressed the same amount as used for Figs. 3 and 8. we conclude composite specimens are interesting boundary value problems but not very good for obtaining constitutive data for the material. We consider now data obtained in smaller initial impacts.

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