Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness

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Volume 5, Issue 3 (May 1977)

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ISSN: 0090-3973
Page Count: 4

Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness
Dorward, RC
Research metallurgists, Kaiser Aluminum & Chemical Corp., Center for Technology, Calif.

Hasse, KR

Abstract

A comparison is made between fracture toughness K^Ic as measured by recommended ASTM procedures and crack arrest toughness K^Ia as measured on more than 100 bolt-loaded double-cantilever beam (DCB) specimens from 7075, 7050, and 7049 alloy plates. Close agreement was found between the two values, K^Ia being on the average about 0.75 ksiin. (0.82 MPa√m) lower than than K^Ic over the range 18 to 29 ksiin. (20 to 32 MPa√m). This indicates that a simplified test based on a bolt-loaded DCB specimen could be used for quality control, lot release, and screening purposes. Measurements of crack length and specimen deflection are all that are required; the specimens do not have to be fatigue precracked, nor is a tensile machine needed.

Keywords:
strains, fractures (materials), aluminum alloys

Paper ID: JTE11634J
DOI: 10.1520/JTE11634J
ASTM International is a member of CrossRef.

Author Title Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness Symposium , 0000-00-00 Committee E08

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of Testing and Evaluation (JTE) / Citation Page Volume 5, Issue 3 (May 1977) Click here to download this paper now for $25 PDF (168K) View License Agreement ISSN: 0090-3973 Page Count: 4 Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness Dorward, RC Research metallurgists, Kaiser Aluminum & Chemical Corp., Center for Technology, Calif. Hasse, KR Abstract A comparison is made between fracture toughness K^Ic as measured by recommended ASTM procedures and crack arrest toughness K^Ia as measured on more than 100 bolt-loaded double-cantilever beam (DCB) specimens from 7075, 7050, and 7049 alloy plates. Close agreement was found between the two values, K^Ia being on the average about 0.75 ksiin. (0.82 MPa√m) lower than than K^Ic over the range 18 to 29 ksiin. (20 to 32 MPa√m). This indicates that a simplified test based on a bolt-loaded DCB specimen could be used for quality control, lot release, and screening purposes. Measurements of crack length and specimen deflection are all that are required; the specimens do not have to be fatigue precracked, nor is a tensile machine needed. Keywords: strains, fractures (materials), aluminum alloys Paper ID: JTE11634J DOI: 10.1520/JTE11634J ASTM International is a member of CrossRef. Author Title Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness Symposium , 0000-00-00 Committee E08