STRESS-STRAIN CHARACTERISTICS OF MATERIALS AT HIGH STRAIN RATES. PART I. DISPLACEMENT MEASUREMENTS DURING HIGH-VELOCITY IMPACTS
These two reports were issued separately, but are cataloged as a unit. A photoelectric method for measuring displacements during high-velocity impacts is described. The theory of thc system is discussed in detail, and a prototype system which was buiit and tested is described. The performance of the prototype system is evaluated by comparing the results which it gives with results obtained by other methods of measurement. The system was found capable of a resolution of at least 0.01 inches. static and dynamic stress-strain characteristics of seven high polymers, polyethylene, teflon, nylon, tenite M, tenite H, polystyrene, and saran, plus three metals, lead, copper, and aluminum, are described and compared by means of stress-strain curves and photographs. Data are also presented which show qualitatively the effects produced on stress-strain characteristics by specimen configuration, temperature, and impact velocity. It is shown that there is a definite strain-rate effect for all these materials except polystyrene. The effect is one of an apparent stiffening of the material with increasing strain rate, which is similar to the effect producod by lowering the temperature. The stress-strain measurements are examined critically, inconsistencies are pointed out, and possible sources of error suggested. Values of yield stress, modulus of elasticity and energy absorption for all materials (except copper and aluminum), specimen configurations, temperatures, and impact velocities included in the investigation are tabulated. (auth)
- Research Organization:
- Texas Univ., Austin, TX (US). Structural Mechanics Research Lab.
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AT(29-2)-621
- NSA Number:
- NSA-13-004719
- OSTI ID:
- 4300455
- Report Number(s):
- SCDC-798
- Resource Relation:
- Other Information: For Sandia Corp.; These two reports were issued separately, but are cataloged as a unit. Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ALUMINUM
AMIDES
CONFIGURATION
COPPER
DEFORMATION
DIAGRAMS
ELASTICITY
ENERGY
ERRORS
IMPACT SHOCK
LABORATORY EQUIPMENT
LEAD
MEASURED VALUES
MOTION
NYLON
ORGANIC FLUORINE COMPOUNDS
PERFORMANCE
PHOTOELECTRIC EFFECT
PHOTOGRAPHY
POLYETHYLENES
POLYMERS
POLYSTYRENE
RESOLUTION
STANDARDS
STRESSES
TABLES
TEFLON
TEMPERATURE
THICKNESS
VELOCITY