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Evaluation of interlayer shear strength

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Conclusions

  1. 1.

    A method of determining the interlayer shear strength of fibrous CM by the bending of a thick specimen with a grooved section, which makes it possible to realize interlayer failure over a broad range ofl b/H for a broad class of polymer composites — carbon-fiber-rein-forced plastic, fiberglass, boron-fiber-reinforced plastic, and organoplastic — is proposed.

  2. 2.

    It is demonstrated that testing of CM specimens with smalll b/H values introduces a certain error due to the appreciable influence exerted by contact pressure on the specimen; it is expedient to test specimens, observing the ratiol b/H=8–12.

  3. 3.

    The shape and geometric dimensions of the specimen, which make it possible to obtain comparable results for different classes of polymer CM, are optimized.

  4. 4.

    The error introduced by varyingl b/H to the shear strength measured by the method of bending a grooved beam is estimated; on a carbon-fiber-reinforced-plastic sample, the error is found to be greater, the thicker the reinforced plastic and the smallerl b/H.

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Literature cited

  1. 1.

    Yu. M. Tarnopol'skii and T. Ya. Kintsis, Methods for the Static Testing of Reinforced Plastics [in Russian], 2nd ed., Moscow (1975).

  2. 2.

    V. A. Polyakov and I. G. Zhigun, “Contact problem for beams of composition materials,” Mekh. Polim., No. 1, 63–74 (1977).

  3. 3.

    V. V. Mikhailov, I. G. Zhigun, and L. A. Ivanova, “A specimen for interlayer-shear tests of fibrous composition materials,” Inventor's Certificate No. 888001, Otkr. Izobr. Prom. Obraz. Tov. Zn., No. 45 (1981).

  4. 4.

    Yu. M. Tarnopol'skii, I. G. Zhigun, and V. A. Polyakov, “Analysis of tangential-stress distribution during the three-point bending of composite beams,” Mekh. Polim., No. 1, 56–62 (1977).

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Additional information

Translated from Mekhanika Kompozitnykh Materialov, No. 4, pp. 723–728, July–August, 1985.

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Mikhailov, V.V., Gunyaev, G.M., Ivanova, L.A. et al. Evaluation of interlayer shear strength. Mech Compos Mater 21, 511–515 (1986). https://doi.org/10.1007/BF00610904

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Keywords

  • Polymer
  • Shear Strength
  • Comparable Result
  • Test Specimen
  • Geometric Dimension