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Download PDF by D R Moore: Application of Fracture Mechanics to Polymers, Adhesives and

By D R Moore

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Additional info for Application of Fracture Mechanics to Polymers, Adhesives and Composites, Volume 33

Example text

Variation in the degree of crystallinity for example is associated with manifold changes both in the spherulitic structure (type, size) and within its constituents (thickness and order of lamellae, amorphous layer thickness, tie molecules density). According to the model of the author both toughness and resistance to fatigue crack propagation (FCP) go through a maximum as a function of the degree of crystallinity (cf. Figure 3) [5,12]. The increasing left hand flank of the curve represents the resistance resulting from the crystalline structure, while the declining right hand part is owing to the lacking connection between the crystalline lamellae (especially the tie molecules which are capable to redistribute the stresses locally, are missing).

Material comparison. In Fig. 5 various poly(propylene) (PP) materials (~-PP(H), [3+-PP(H) and u-PP(RC)) are compared in terms of the loading rate dependence of their respective F/FLL-ratios. Clearly, the materials investigated differ in terms of both the quantitative positions of the d/sbtransition points on the loading rate scale and the loading rate difference between plane stress and plane strain d/sb-transition points. More detailed numerical comparisons for all materials investigated see elsewhere [2].

The change of slope of this curve may indicate a transition in the resistance to crack propagation from the low to the high rates of crack growth. 7. 6 MPa ml/2 the blend morphology consisting of rubber particles in a matrix is 36 F. RAMSTEINER 1 E-02 - ..... :. i }:.... i ..... ,= o o>' 1 E-04 z ] E-05 .............................. 1 E-06 ': ................. ~ ............ i. ~........ ~ ...... i...... i.............................. i ...... ~ .............. ~ ...............................

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