Stress softening characteristics of thin monoholar rubber flat slab
Keywords:
Thin Monoholar, Stress softening, Elastomeric material, Permanent set strain, Hysteresis loss energyAbstract
Thin monoholar rubber flat slab gives rise to unconventional mechanical properties under tension loading not found in thin solid rubber flat slab. However there has been no proper report on its stress softening characteristics. Stress softening is an important phenomenon occurring in all elastomeric materials under cyclic tension loading. Parameters pertinent to stress softening investigated in this research are stress-strain characteristics, permanent set strain and hysteresis loss energy of the thin monoholar rubber flat slab in comparison with the thin solid rubber fat slab when undergoing 7 cycles of stretching. Noticeable differences of stress-strain hysteresis loops diminution of the thin monoholar rubber flat slab and the solid rubber flat slab have been observed. However difference in stress softening between both types of flat slab is not so pronounced. The monoholar rubber flat slab specimens have larger permanent set strain and hysteresis loss energy diminution compared with those of the solid rubber flat slab. If both permanent set strain and hysteresis loss energy diminution have been properly accounted for, stress softening may not be a matter of great concern when the monoholar rubber flat slab is adopted in practical applications.
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