By Markus Reiner (auth.), Ulric S. Lindholm (eds.)
An enough actual and mathematical description of fabric be havior is simple to all engineering purposes. thankfully, many prob lems could be taken care of totally in the framework of elastic fabric reaction. whereas even those difficulties may possibly develop into yuite advanced be reason behind geometrical and loading stipulations, the linearity, reversibility, and price independence ordinarily acceptable to elastic fabric descrip tion definitely eases the duty of the analyst. this present day, although, we're in creasingly faced with functional difficulties which contain fabric reaction that's inelastic, hysteretic and price established mixed with loading that's brief in nature. those difficulties contain, for example, structural reaction to relocating or impulsive rather a lot, all of the parts of ballistics (internal, exterior and terminal), touch stresses less than excessive pace bearings, excessive velocity machining, rolling and different steel operating methods, explosive and effect forming, surprise attenuation buildings, seismic wave propagation, etc of equivalent im portance. As those difficulties have been encountered, it turned more and more obvious that we didn't have to hand the actual or mathematical description of the habit of fabrics essential to produce practical strategies. therefore, over the past ten years relatively, there was significant attempt expended towards the new release of either experi psychological info at the dynamic mechanical reaction of fabrics in addition to the formula of practical constitutive theories. It used to be the aim of the Symposium at which the articles during this booklet have been awarded to debate and evaluate contemporary advancements during this field.
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Additional resources for Mechanical Behavior of Materials under Dynamic Loads: Symposium Held in San Antonio, Texas, September 6-8, 1967
5) Larger impacts cause a given level of strain to propagate faster (compare Tables 1 and 2) than smaller ones. The wave speeds obtained by averaging all the data for large impacts between x = 4 and x = 12 in. and for the small hits between x = 4 and x = 14 in. are shown in Fig. 16. (6) There is a reasonably good chance of being able to initiate a small plastic deformation wave which propagates more or less normally for some distance, and then suddenly stops or slows down very drastically (Figs.
In. (1450 psi). /in. is established in the hard section at the time when the strain in the soft section is only 235 JLin. /in. /in. Without being firmly committed, an examination of Fig. 1 reveals several plateaus with approximately this value for the change in strain at constant stress. It is desirable to emphasize that the exact value of the strain in the plateau in tests like that represented by Fig. 13 varies somewhat, but in all other respects it is very typical. We have many results which are virtually identical with Fig.
The theoretical stress maximum is for a mode index of r = 2. 17 COPPER POLYCRYSTALS 16 '",Q 12 " ·iii 8 a. b Test 12 48 4 0 Vo 0 100 = 1540 em/sec 200 300 400 500 700 600 12 '", . 0 ·iii O"mox 8 r= Q. b 4 Test 1241 Vo 0 4 0 100 = 1250 em/sec 200 300 400 500 TI ME. J1- sec Fig. 8. Two load bar experiments in annealed polycrystalline copper at the designated impact velocities showing the agreement of the maximum stress with the predicted value for a mode index of r = 4. Note the absence of an intermediate dynamic overstress.