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Title : Impact of stress relaxation on surface pressure changes of apples
Key words : stress relaxation, surface pressure, displacement, apple
Summary :

In the paper changes of surface pressures distributions as a function of time for apples subjected to stress relaxation tests were presented. Compression tests of whole fruit were carried out in order to determine maximum displacements leading them to material damage. Based on the obtained curves F = f (ΔL) displacement values were determined, above which processes of intensive destruction of apple parenchyma structure take place. Stress relaxation tests at dislocation corresponding to local fruit damage - at the level of 20% of the value ΔL max were carried out, at the same registering the surface pressure distribution. During relaxation clear changes of surface pressure were reported. Stress relaxation process was characterized by a gradual reduction of maximum surface pressure to the level of 0.31 MPa and clear homogenization of their transverse distribution. Levelling transverse distribution of surface pressure is visible after approximately 300 s from the moment of placing the load - 150 s from the moment of starting the relaxation process.

Please use the following format to cite the selected article : Komarnicki, P., Stopa, R., Młotek, M. (2013). Impact of stress relaxation on surface pressure changes of apples. Inzynieria Rolnicza, 3(145), 127-138.
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