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Title: EFFECT OF STATIC PRESTRAIN ON THE PROT-FATIGUE PROPERTIES OF UNNOTCHED AND NOTCHED MATERIALS AT ROOM AND ELEVATED TEMPERATURE. Period covered: January 1956 to December 1957

Abstract

A study was conducted on the effect of short time and creep prestrain on the fatigue properties of unnotched and notched specimens of the alloys 7075-T6 extruded, 2024-T4 extruded, 16-25-6 hot-cold-worked, and S-816 solution treated and aged. Fatigue properties were determined using a Prot-type test with a single loading rate of 0.01 psi per cycle. The unnotched and notched specimens were prestrained at test temperature and then immediately subjected to a Prot- type fatigue test at the same temperature and in the same testing machine. The test temperature for the short time prestrain and creep prestrain, respectively, were 75 and 300 deg F for 7075-T6, 300 and 5OO deg F for 2024-T4, 1200 deg F for 16-25-6, and 1500 deg F for 8-816. Short-time prestrains up to 10% were applied. Stresses used for the creep prestrains corresponded to those which produced rupture in 100 to 200 hours at test temperature. The main factors influencing the Prot-failure stress were residual stresses, metallurgical reactions, and cracks produced by prestraining. Strain hardening and relaxation of residual stress appeared to be of secondary importance for the materials and range of testing variables investigated. (auth)

Authors:
Publication Date:
Research Org.:
Minnesota. Univ., Minneapolis
OSTI Identifier:
4293541
Report Number(s):
WADC-TR-58-214; AD-155738; PB-
NSA Number:
NSA-13-008997
DOE Contract Number:
AF33(616)-2803
Resource Type:
Technical Report
Resource Relation:
Other Information: Project title: MATERIALS ANALYSIS AND EVALUATION TECHNIQUES. Task title: FATIGUE PROPERTIES OF STRUCTURAL MATERIALS. Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; ALLOY-S-816; ALLOYS; ALUMINUM ALLOYS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; COBALT ALLOYS; COLD WORKING; CRACKS; CREEP; DEFORMATION; EXTRUSION; FAILURES; FATIGUE; FREQUENCY; HEAT TREATMENTS; HIGH TEMPERATURE; HOT WORKING; MATERIALS TESTING; MECHANICS; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NIOBIUM ALLOYS; PRESSURE; STRESSES; TEMPERATURE; TEMPERING; TUNGSTEN ALLOYS

Citation Formats

Vitovec, F.H.. EFFECT OF STATIC PRESTRAIN ON THE PROT-FATIGUE PROPERTIES OF UNNOTCHED AND NOTCHED MATERIALS AT ROOM AND ELEVATED TEMPERATURE. Period covered: January 1956 to December 1957. United States: N. p., 1958. Web.
Vitovec, F.H.. EFFECT OF STATIC PRESTRAIN ON THE PROT-FATIGUE PROPERTIES OF UNNOTCHED AND NOTCHED MATERIALS AT ROOM AND ELEVATED TEMPERATURE. Period covered: January 1956 to December 1957. United States.
Vitovec, F.H.. Tue . "EFFECT OF STATIC PRESTRAIN ON THE PROT-FATIGUE PROPERTIES OF UNNOTCHED AND NOTCHED MATERIALS AT ROOM AND ELEVATED TEMPERATURE. Period covered: January 1956 to December 1957". United States. doi:.
@article{osti_4293541,
title = {EFFECT OF STATIC PRESTRAIN ON THE PROT-FATIGUE PROPERTIES OF UNNOTCHED AND NOTCHED MATERIALS AT ROOM AND ELEVATED TEMPERATURE. Period covered: January 1956 to December 1957},
author = {Vitovec, F.H.},
abstractNote = {A study was conducted on the effect of short time and creep prestrain on the fatigue properties of unnotched and notched specimens of the alloys 7075-T6 extruded, 2024-T4 extruded, 16-25-6 hot-cold-worked, and S-816 solution treated and aged. Fatigue properties were determined using a Prot-type test with a single loading rate of 0.01 psi per cycle. The unnotched and notched specimens were prestrained at test temperature and then immediately subjected to a Prot- type fatigue test at the same temperature and in the same testing machine. The test temperature for the short time prestrain and creep prestrain, respectively, were 75 and 300 deg F for 7075-T6, 300 and 5OO deg F for 2024-T4, 1200 deg F for 16-25-6, and 1500 deg F for 8-816. Short-time prestrains up to 10% were applied. Stresses used for the creep prestrains corresponded to those which produced rupture in 100 to 200 hours at test temperature. The main factors influencing the Prot-failure stress were residual stresses, metallurgical reactions, and cracks produced by prestraining. Strain hardening and relaxation of residual stress appeared to be of secondary importance for the materials and range of testing variables investigated. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 15 00:00:00 EST 1958},
month = {Tue Apr 15 00:00:00 EST 1958}
}

Technical Report:
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