Accession Number : ADA302507

Title :   Prediction of Stress Relaxation for Compression and Torsion Springs.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS

Personal Author(s) : Chang, D. J.

PDF Url : ADA302507

Report Date : 01 NOV 1995

Pagination or Media Count : 21

Abstract : An analytical technique was developed to predict the stress relaxation for compression and torsion springs. The technique uses uniaxial tensile-generated stress-relaxation data for spring wires. Based on the tension-induced stress-relaxation data, the technique was applied to compression springs, where shear stress dominates in predicting the stress relaxation. This report documents the developed prediction method for stress-relaxation of compression and torsion springs and demonstrates the technique using experimental data. When applied to a V-band compression spring made of 302 stainless steel wire, a predicted 2.6% load reduction was obtained after 1000 hr loading as compared with the experimentally measured 2.1% load reduction. Since residual stresses play a significant role over the maximum operating stress range in compression and torsion springs, the calculation method of residual stress is also presented. (MM)

Descriptors :   *POTENTIAL ENERGY, *LAUNCH VEHICLES, *SPRINGS, *STRESS RELAXATION, COMPRESSION, STRESS STRAIN RELATIONS, SPACECRAFT, WIRE, MODULUS OF ELASTICITY, HIGH STRENGTH ALLOYS, SHEAR STRESSES, RESIDUAL STRESS, ARTIFICIAL SATELLITES, ENERGY STORAGE, TORSION, V BAND.

Subject Categories : Energy Storage
      Mechanics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE