Constitutive models for rubber VII : proceedings of the 7th by Stephen Jerrams; Niall M Murphy

By Stephen Jerrams; Niall M Murphy

Content material: Invited papers -- Mechanical characterization of rubber : novel methods -- Modelling and simulation -- harm mechanisms in elastomers -- pressure softening and similar phenomena -- layout and functions -- Fatigue and time based behaviour -- try tools and analytical recommendations

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Additional info for Constitutive models for rubber VII : proceedings of the 7th European Conference on Constitutive Models for Rubber, ECCMR, Dublin, Ireland, 20-23 September 2011

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It allowed to determine the deformation gradient F from which the two stretch ratios in the directions parallel to the plane of tension are extracted. The general form of the deformation gradient, assuming incompressibility, is: composed of four electrical actuators, which displacements can be synchronized or not. Their loading capacity is ±500 N and their stroke is 75 mm each. All the experiments are conducted by prescribing the displacement of these actuators. Opposite actuators always have opposite equal displacements in order to keep the central zone of the sample fixed.

7/min). Figure 6b. 7/min). Figure 5b. 7/min). In these figures, one can notice a stress relaxation phenomenon that occurs at a strain that depends on both temperature and strain range. 05 for the lowest strain rate. This phenomenon is associated to SIC: when a crystallite grows parallel to the axis of elongation, the distance between the remaining amorphous segments is decreased. Consequently these segments can accept a greater number of configurations (Flory 1947). This theoretical prediction of Flory has been confirmed by recent experimental studies combining stress-strain curves and X-rays measurements (Albouy et al.

We can also observe that the onset strain of NR crystallization is shifted to a smaller value when the material is filled by carbon black (un-presented curve). This fact confirms that fillers act as amplifiers of local draw ratio. In order to avoid sample microstructure evolution due to Mullins effect, the study of SIC is performed Figure 3. 25 min−1 ). Reproduced from Polymer 48 (2007) 6893–6901. of the sample causes a pressure change relative to the reference chamber. Thus the pressure difference can be converted into a volume change of the sample.

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