Author: University of Texas. Structural Mechanics Research LaboratoryPublisher:
ISBN:
Category : Strains and stresses
Languages : en
Pages :
Book Description
Stress-strain Characteristics of Materials at High Strain Rates: The propagation of plastic waves in finite cylinders of strain-rate-dependent material
Author: University of Texas. Structural Mechanics Research LaboratoryPublisher:
ISBN:
Category : Strains and stresses
Languages : en
Pages :
Book Description
STRESS-STRAIN CHARACTERISTICS OF MATERIALS AT HIGH STRAIN RATES. PART VI. THE PROPAGATION OF PLASTIC WAVES IN FINITE CYLINDERS OF STRAIN-RATE-DEPENDENT MATERIAL.
Author: Applied Mechanics Reviews
Author: Stress-strain Characteristics of Materials at High Strain Rates: Strain-rate effects and plastic wave propagation
Author: University of Texas. Structural Mechanics Research LaboratoryPublisher:
ISBN:
Category : Strains and stresses
Languages : en
Pages :
Book Description
Nuclear Science Abstracts
Author: Stress-Strain Characteristics of Materials at High Strain Rates. Part III. Strain Rate Effects and Plastic Wave Propagation
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The existing theories pertaining to the propagation through rods or wires of stresses exceeding the proportional limit are not in agreement with some aspects of experimental results. In order to resolve these differences, accurate dynamic stress-strain diagrams, obtained under conditions of constant strain rate, are especially required in order to establish the effect of strain rate upon the dynamic stress-strain law. A brief survey is made of the experimental techniques which have been employod in the past for measuring transient loads and strains aad for deducing the strain-rate effects. Based on the assumptions made in these previous methods and the results obtained from them, a direct method of recording simultaneously the stress-time and strain-time curves was chosen and impact tests were conducted on short, hollow cylinders of aluminum and copper at strain rates from 40 to 1600 in./in./sec. The method did not permit the establishing of complete stress-strain diagrams, but the ultimate stresses and elastic moduli were obtained and have been presented as functions of strain rate. The results of the experimental investigation show that: (1) The ultimate stress for 606l-T6 aluminum alloy cylinders increases approximately uniformly with increase in strain rate at about 5.4 psi per in./in./sec. (2) The ultimate stress for the copper increases from the static test value of 49,400 psi to 60,000 psi at a strain rate of 200 in./in./ sec. From this point, the stress then increases uniformly at about 4.5 psi per in./in./sec. (3) Great care must be taken to insure planeness of impact when the ratio of the length to diameter of the specimen is small; otherwise test results may vary widely. (4) The basic method used does not give the complete stress-strain diagram because of difficulties of interpretation of the test records in the vicinity of the elastic limit stress. (5) A second method, used for the 1600 in./in./sec strain rates, offers more promise for further development. (6) The effective elastic modulus, sigma / epsilon, of copper decreases with increase in strain rate. (auth).
Stress-strain Characteristics of Materials at High Strain Rates
Author: James W. TurnbowU.S. Government Research Reports
Author: Reports
Author: Civil Aeromedical Research Institute (U.S.)Publisher:
ISBN:
Category : Aviation medicine
Languages : en
Pages : 646
Book Description
The propagation of plastic waves in finite cylinders of a strain-rate-dependent material
Author: Byron Dean TapleyPublisher:
ISBN:
Category : Plasticity
Languages : en
Pages : 262
Book Description