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Effect of small vibrations on cracking kinetics in polymethyl methacrylate. Concept of a rate-dependent cracking resistance. Possible thermal mechanism

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Conclusions

1. Small vibrations superposed on the main static component of an external load cause the cracking rate in polymethyl methacrylate to increase appreciably. Within the range of low cracking rates (<10−4 cm/sec), evidently most important from the practical standpoint, the cracking resistance of this material is also found to decrease.

2. The concept of a rate-dependent cracking resistance applies to conditions under a vibration load, over a wide range of vibrations at low or intermediate cracking rates.

3. The effect of small vibrations is local in nature. It may have to be taken into account, if cracks or similar defects already exist in a structure or appear in it during service.

4. The thermal mechanism is not adequate for quantitatively describing the experimentally observed effect of vibration.

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Authors
  1. Yu. P. Zezin
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  2. I. M. Kershtein
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Additional information

M. V. Lomonosov Moscow State University. Translated from Mekhanika Polimerov, No. 5, pp. 846–853, September–October, 1977.

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Zezin, Y.P., Kershtein, I.M. Effect of small vibrations on cracking kinetics in polymethyl methacrylate. Concept of a rate-dependent cracking resistance. Possible thermal mechanism. Polymer Mechanics 13, 709–715 (1977). https://doi.org/10.1007/BF00860322

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  • DOI: https://doi.org/10.1007/BF00860322

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