Title

Effect Of Testing System Stiffness On Fracture

Date

1964

Index Abstract

Not Available

Photo Quality

Complete

Report Number

ML TDR 64-150

Creator

Weiss, V.

Grewal, K. S.

Sessler, J.

Corporate Author

Syracuse Univ N Y

Laboratory

Air Force Materials Laboratory

Extent

41

Identifier

AD0602158

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(657)-11154

DoD Project

7350

DoD Task

735003

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Distribution Conflict

No

Abstract

A preliminary study of the influence of testing system stiffness on the fracture of center-cracked sheet specimens of 7075-T6 aluminum indicated a noticeable effect of testing system stiffness on crack propagation in that decreasing the testing system stiffness resulted in the suppression of the slow or intermittent crack growth. A controlled experimental program on titanium RS 140 to study the interplay between specimen length and crack length, the two variables affecting the stiffness of the specimen, showed an effect of testing system stiffness on both crack propagation and fracture strength. Compliance curves, obtained with a specially designed compliance gage, showed a higher strain energy release rate for a given incremental crack growth dc in short specimens. The lower fracture strength observed in short specimens may be explained on this basis. Both energy and stress considerations of the effects of testing system stiffness are presented. An analysis of stiffness effects on crack propagation behavior is attempted.

Report Availability

Full text available

Date Issued

1964-04

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Format

1 online resource