Polypropylene stress-strain diagram

F i gu re 5.16 8 Thermal-oxidative aging behavior of polypropylene Left stress-strain diagram Right strain at break... 

FIG. 4 Engineering stress-strain diagrams of polypropylene 1120 LX as a function of the structure curve 1, fully quenched structure curve 2, partially coarse spherulitic structure curve 3, coarse spherulitic structure. (From Ref. 13.)... 

Figure 12.21 Schematic description of the effect of hybrid reinforcement (glass, polypropylene, hybrid) on the stress-strain diagram (from Xu and Hannant [104]).

The mechanical response of polypropylene foam was studied over a wide range of strain rates and the linear and non-linear viscoelastic behaviour was analysed. The material was tested in creep and dynamic mechanical experiments and a correlation between strain rate effects and viscoelastic properties of the foam was obtained using viscoelasticity theory and separating strain and time effects. A scheme for the prediction of the stress-strain curve at any strain rate was developed in which a strain rate-dependent scaling factor was introduced. An energy absorption diagram was constructed. 14 refs. 

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