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Abstract：
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The stress disrtrbuting hypothesis of the broken surface,the hardening presetting concept and torque,the broken surface remain stress and the calculating method of the remain deformed angle to the torsion bar spring when it was turned under the plastic hardening condition were put forward.The calculating result shows that when the preset deformation of the torsion bar spring is bigger,three deformed areas appeares which are elastic deformed area,yield deformed area and hardening deformed area.According to the hardening preset theory,the loading capacity of the torsion bar spring can be improved over 80%,wicth breaks the 33% limited improvement to the loading capacity of the yield preset.The strain angle of preset can break the limit γ≈0.022 and be up to over γ≈0.034.The calculating result is close to the actual state.
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AuthorIntro：
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Reference：
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