Predication method of stress relaxation life of torsion spring

A torsion spring and stress relaxation technology, applied in the field of predicting the life of torsion springs, can solve problems such as torsion springs that have not yet been found, and achieve the effects of reducing test costs and cycles, good reliability, and high prediction accuracy.
CN105910883AInactive Publication Date: 2016-08-31TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2016-08-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a predication method of the stress relaxation life of a torsion spring, and belongs to a torsion spring life prediction technology. The method comprises the following steps: drawing the torque-time curve of the torsion spring at different temperatures; drawing the internal stress-time curve of the torsion spring at different temperatures; reckoning the semi-logarithmic relationship between the relax rate and time; calculating a relaxation factor A room temperature and a relaxation factor B room temperature; and calculating the stress relaxation life of the torsion spring. The method is characterized in that the torque-time curve, the internal stress-time curve and the relaxation rate-time logarithm curve at a test temperature are obtained in a different temperature accelerated torsion spring mode, and a stress relaxation equation at a practical use temperature of the torque spring is derived to predicate the stress relaxation life of the torsion spring. The method has the advantages of high predication accuracy, effective reduction of the test cost and the cycle, and efficiency increase.
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Description

technical field

[0001] The invention relates to a method for predicting the stress relaxation life of a torsion spring, which belongs to the technology of predicting the life of a torsion spring. Background technique

[0002] The essence of stress relaxation is that the material produces microplastic deformation under the action of stress, and gradually accumulates it. Under the premise of keeping the strain or displacement constant, it is a phenomenon that the stress decreases with time. Stress relaxation is a fairly common phenomenon. It exists not only in elastic elements or components made of metal materials, but also in components made of non-metallic materials. It is a variety of mechanical springs (such as valve springs and buffer springs, etc.) One of the main failure modes of elastic components in basic parts such as bolts, precision instruments and meters. These phenomena are not uncommon in daily life, and serious cases will cause huge economic losses.

[0003] ...

Claims

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