New Measurement Method of Mode II Threshold Stress Intensity Factor ΔKτ Range and Its Application

Yukitaka Murakami; Shigeru Hamada; Kazuo Sugino; Ken ichi Takao

doi:10.2472/jsms.43.1264

New Measurement Method of Mode II Threshold Stress Intensity Factor ΔK_τ Range and Its Application

Yukitaka Murakami, Shigeru Hamada, Kazuo Sugino, Ken ichi Takao

Strength of materials

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

In order to measure the Mode II fatigue crack growth resistance of SS41 steel and a rail steel, a particular double-cantilever type specimen with side grooves was designed. Mode II fatigue crack growth tests by using the newly designed specimens were conducted by a conventional closed-loop type tension-compression fatigue testing machine under a constant load amplitude which corresponds to ΔK_II-decreasing test with increase in crack length. The crack length was measured by the AC potential method. Mode II crack growth rate gradually decreased as the crack grew. The typical fracture surface of Mode II fatigue crack growth which was quite different from Mode I fatigue fracture surface was observed. But the trace of local branching of crack growth mode from Mode II to I was observed on the overall fracture surface of Mode II. The relationship between Mode II crack growth rate (da/dN) and ΔK_II was obtained.

Original language	English
Pages (from-to)	1264-1270
Number of pages	7
Journal	Journal of the Society of Materials Science, Japan
Volume	43
Issue number	493
DOIs	https://doi.org/10.2472/jsms.43.1264
Publication status	Published - 1994

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Cite this

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title = "New Measurement Method of Mode II Threshold Stress Intensity Factor ΔKτ Range and Its Application",

abstract = "In order to measure the Mode II fatigue crack growth resistance of SS41 steel and a rail steel, a particular double-cantilever type specimen with side grooves was designed. Mode II fatigue crack growth tests by using the newly designed specimens were conducted by a conventional closed-loop type tension-compression fatigue testing machine under a constant load amplitude which corresponds to ΔKII-decreasing test with increase in crack length. The crack length was measured by the AC potential method. Mode II crack growth rate gradually decreased as the crack grew. The typical fracture surface of Mode II fatigue crack growth which was quite different from Mode I fatigue fracture surface was observed. But the trace of local branching of crack growth mode from Mode II to I was observed on the overall fracture surface of Mode II. The relationship between Mode II crack growth rate (da/dN) and ΔKII was obtained.",

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T1 - New Measurement Method of Mode II Threshold Stress Intensity Factor ΔKτ Range and Its Application

AU - Murakami, Yukitaka

AU - Hamada, Shigeru

AU - Sugino, Kazuo

AU - Takao, Ken ichi

PY - 1994

Y1 - 1994

N2 - In order to measure the Mode II fatigue crack growth resistance of SS41 steel and a rail steel, a particular double-cantilever type specimen with side grooves was designed. Mode II fatigue crack growth tests by using the newly designed specimens were conducted by a conventional closed-loop type tension-compression fatigue testing machine under a constant load amplitude which corresponds to ΔKII-decreasing test with increase in crack length. The crack length was measured by the AC potential method. Mode II crack growth rate gradually decreased as the crack grew. The typical fracture surface of Mode II fatigue crack growth which was quite different from Mode I fatigue fracture surface was observed. But the trace of local branching of crack growth mode from Mode II to I was observed on the overall fracture surface of Mode II. The relationship between Mode II crack growth rate (da/dN) and ΔKII was obtained.

AB - In order to measure the Mode II fatigue crack growth resistance of SS41 steel and a rail steel, a particular double-cantilever type specimen with side grooves was designed. Mode II fatigue crack growth tests by using the newly designed specimens were conducted by a conventional closed-loop type tension-compression fatigue testing machine under a constant load amplitude which corresponds to ΔKII-decreasing test with increase in crack length. The crack length was measured by the AC potential method. Mode II crack growth rate gradually decreased as the crack grew. The typical fracture surface of Mode II fatigue crack growth which was quite different from Mode I fatigue fracture surface was observed. But the trace of local branching of crack growth mode from Mode II to I was observed on the overall fracture surface of Mode II. The relationship between Mode II crack growth rate (da/dN) and ΔKII was obtained.

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New Measurement Method of Mode II Threshold Stress Intensity Factor ΔK_τ Range and Its Application

Abstract

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