Accession Number : AD0720844

Title :   Research on Energy Absorbing Structures. Part IX.

Descriptive Note : Annual rept. 1 Feb 70-1 Feb 71 (Final),

Corporate Author : ARA INC WEST COVINA CALIF

Personal Author(s) : Mazelsky,Bernard ; Lin,T. H. ; Lin,Sheng-Rong ; Hewitt,Robert R.

Report Date : 08 FEB 1971

Pagination or Media Count : 62

Abstract : An analytical method for predicting the elasto-plastic bending of rectangular plates with large deflection is studied. The concept of equivalent body force is applied to account for the plastic strain gradients and the non-linear terms of displacement derivatives. The calculated deflection for purely elastic plates compares well with other existing solutions. The deflection is increased slightly by plastic strain; however, the stress is considerably relieved by plastic yielding. Nuclear Quadrupole Resonance(NQR) on dilute inert fillers in several polymers and adhesives is made as a function of compression and tension. The change in the NQR response is found to be proportional to the strain applied to the host material. NQR measurements on reinforced polymers and adhesive bonds are reported. (Author)

Descriptors :   (*PANELS, BENDING), (*REINFORCED PLASTICS, NONDESTRUCTIVE TESTING), (*AIRFRAMES, PANELS), DEFLECTION, STRUCTURAL PROPERTIES, ITERATIONS, STRESSES, REINFORCING MATERIALS, SPECTROMETERS, STRAIN(MECHANICS), COMPUTER PROGRAMS

Subject Categories : Laminates and Composite Materials
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE