Author: Chun DongPublisher:
ISBN:
Category : Metals
Languages : en
Pages :
Book Description
J Integer Fracture Toughness Testing of Alloy 718
Author: Chun DongApplication of the Normalization Method to Dynamic Fracture Toughness Testing of Alloy 718
Author: SM. GrahamPublisher:
ISBN:
Category : Alloy 718
Languages : en
Pages : 14
Book Description
The fracture toughness and tensile properties of Alloy 718 were measured at quasi-static and dynamic loading rates for two different heat treatments and two product forms. Two different methods for conducting the dynamic tests were investigated; one involving interrupted tests and the other utilizing a single impact. The interrupted test method used multiple impacts with displacement limits to enable measurement of crack lengths at intermediate points. The normalization method was used to generate tearing resistance curves for the dynamic tests following the guidelines in ASTM Standard Test Method for measurement of Fracture Toughness (E 1820). The analysis pointed out the importance of obtaining a good measurement of load, displacement, and crack length at the point of maximum displacement (the anchor point). As the amount of ductile crack extension increased, the uncertainty in the plasticity function fit also increased. Methods to improve the fit were investigated, including the addition of anchor points from multiple tests, and use of a tangency point to estimate initiation. The resulting curves are compared to ascertain the variability obtained from nominally identical specimens, and to evaluate the effect of loading rate on the plasticity function. The normalization tearing resistance curves are compared with curves generated from the interrupted tests using compliance measurements during unloads to determine crack extension. Good agreement was obtained between the two methods of measuring tearing resistance, thereby validating the normalization analysis. The tests showed that multiple impacts drive down the tearing resistance, which may be significant in applications where a dynamic event causes load fluctuation.
Fracture Toughness Testing and Its Applications
Author: Data sheet on fracture toughness and high-cycle fatigue properties of alloy 718 cast materials
Author: Fracture Toughness Testing and Its Applications
Author: ASTM Committee E-24 StaffPublisher: ASTM International
ISBN: 9780803101050
Category : Technology & Engineering
Languages : en
Pages : 430
Book Description
Fracture Toughness of High-Strength Alloys at Low Temperature--A Review
Author: JE. CampbellPublisher:
ISBN:
Category : Alloy steels
Languages : en
Pages : 18
Book Description
According to available information on the fracture toughness of high-strength alloys at low temperatures, the effect of low temperatures on toughness is generally dependent on the alloy base. For many aluminum alloys, the fracture toughness tends to increase or remain generally constant as the testing temperature is decreased. Titanium alloys tend to have lower toughness as the testing temperature is decreased, but the effect is influenced by the alloy content and heat treatment. Certain titanium alloys retain good toughness at very low temperatures. Alloy steels normally exhibit decreasing fracture toughness as the testing temperature is decreased through the transition temperature range, when the structure contains ferrite or tempered martensite. The transition temperature is influenced by the alloy content, grain size, and heat treatment. Low temperatures apparently have little effect on the fracture toughness of Inconel Alloy 718. These trends are reviewed based on current state-of-the-art information. Limited information on the fatigue crack growth rates of 2219-T87 aluminum alloy and Ti-6A1-4V alloy indicate that the slope of the da/dN curves is changed as the testing temperature is decreased.
Current Methods of Fracture-toughness Testing of High-strength Alloys with Emphasis on Plane Strain
Author: J. E. CampbellPublisher:
ISBN:
Category : Alloys
Languages : en
Pages : 32
Book Description
Fracture-toughness testing using principles of fracture mechanics has developed to the point where it can be used as a basis for selection of materials, for estimating limiting design stresses assuming the presence of small flaws, and for analyzing failures. Current methods of measuring plane-stress and plane-strain fracturetoughness parameters are presented in this report. The specimens include center-cracked, edge-cracked, single-edge-cracked, surface-cracked, and notched round bars, which are subjected to tensile loading, and notched bars for bend tests. The different types of specimens permit evaluating sheet, plate, bar stock, and forgings as well as material from failed structures. Application of fracture-toughness parameters to design of high-strength structures is reviewed for both static and fatigue loading. Consideration of the fracture-mechanics concepts in design should lead to fewer problems with brittle fracture in high-strength structures. (Author).
Effect of Heat Treatment on the Elevated Temp. Tensile and Fracture Toughness Response of Alloy 718
Author: Progress in Flaw Growth and Fracture Toughness Testing
Author: John Gilbert KaufmanPublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 512
Book Description
Title on spine: Fracture toughness testing.
Rapid Inexpensive Tests for Determining Fracture Toughness
Author: National Research Council (U.S.). Committee on Rapid Inexpensive Tests for Determining Fracture ToughnessPublisher: National Academies
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 266
Book Description