Accession Number : AD0686232

Title :   THE INCLUSION OF TENSO-SENSITIVE LATTICE OF AN ATTACHED SENSOR DURING THE DEFORMATION OF AN ELEMENT UNDER INVESTIGATION,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Makeev,A. I.

Report Date : 16 DEC 1968

Pagination or Media Count : 13

Abstract : The author attempts to evaluate the effect of rigidity of base, grid, cement, and tested element on the operating characteristics of the sensitive elements of strain gages. The stresses in the cement base of the sensor are greatest at the ends of the strain-sensitive grid, therefore the turns of the grid of loop strain-gage sensors must be carefully cemented to the base of the sensor. When the base of the sensor is enlarged its sensitivity coefficient also rises. A change in the modulus of rigidity of the cement under the effect of temperature, moisture, degree of deformation, and other factors leads to a change in sensor sensitivity. The sensitivity of the strain-gage sensor depends on the material of the part undergoing tests. Residual stresses in the cement occurring after hardening have an unfavorable effect on the work of the strain-gage sensor since they may change in time. It is advisable to subject the cemented strain-gage sensor to additional heat treatment or to cyclical deformation to reduce the residual stresses in the cement. The sensitivity coefficient of the strain-gage sensor increases with decreasing cement layer thickness and rising shear modulus in the cement. The distance from the end of the grid to the end of the strain-gage base must be selected in relationship to the rigidity properties of the cement, base material, and wire material. (Author)

Descriptors :   (*STRAIN GAGES, STRESSES), DETECTORS, EMBEDDING SUBSTANCES, CEMENTS, BONDING, DEFORMATION, SHEAR STRESSES, SENSITIVITY, USSR

Subject Categories : Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE