| Effects of Solidification Structure on Fatigue Crack Growth in AC4CH cast Aluminum Alloys |
1995 |
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| Authors:
Shinji Kumai; Jianqun Hu; Yakichi Higo; Shigetomo Nunomura; TOKYO INST OF TECH (JAPAN)
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 | This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: ac4ch materials related terms: crack growth rate, ductility, fatigue crack growth, magnesium addition, paris regime, sem, silicon addition, solidification, stress intensity, ultimate tensile strength processing: casting miscellaneous and special technical terms: aluminum alloys , eutectic particles, microstructure. |
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| Effects of Roughness-Induced Crack Closure on Fatigue Crack Growth in AC4CH Cast Aluminum Alloys |
1995 |
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| Authors:
Shinji Kumai; Akinori Sekikawa; Jianqun Hu; Yakichi Higo; Shigetomo Nunomura; TOKYO INST OF TECH (JAPAN)
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| This paper concerned metals in some important way and contained information about, utilized, or discussed these subjects: basic topics: experimental materials and material types: al-7si, aa 6061, ac4ch materials related terms: crack closure, crack growth rate, crack growth resistance, eutectic structure, fatigue crack growth, scanning electron microscopy(see also sem), silicon addition, solidification, stress intensity processing: powder metallurgy miscellaneous and special technical terms: aluminum alloys, castings, microstructure. |
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| Evaluation of Tensile Properties Using a TEM Disk-Size Specimen |
1993 |
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| Authors:
Shigetomo Nunomura; Tohoru Nishijima; Yakichi Higo; Akimichi Hishinuma; TOKYO INST OF TECH YOKOHAMA (JAPAN) RESEARCH LAB OF PRECISION MACHINERY AND E LECTROMETALLURGY
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| Tensile strengths of 316l stainless steel and 7075-t6 aluminum alloys have been measured using miniature four point bend tests. test results agreed with those standard size specimens. |
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| ENVIRONMENTAL STRESS CRACK PROPAGATION ON PMMA |
NOV 88 |
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| Authors:
Tomoko Natsui; Yakichi Higo; Shigetomo Nunomura; Junichiro Matsuoka
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| in these days polymer materials become interesting to use for engineering parts and many research are running. during when polymer materials are used they are exposed to various environmental conditions, for example, temperature, humidity, or oil and soon. plastics are well known that they are influenced by these atmospheres. in this work the environmental stress crack (esc) propagation on poly(methylmethacrylate) (pmma) was studied by use of compact tension (ct) specimens ... |
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| FUNCTIONAL EVALUATION DEVICE CAPABLE OF EVALUATING AN ARTIFICIAL DEVICE BY THE USE OF ACOUSTIC EMISSION - PATENT 4,819,753 |
13 NOV 86 |
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| Authors:
Yakichi Higo; Shigetomo Nunomura; Masashi Ono
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| more accurate load measurement in charpy impact bending tests |
75 |
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| Authors:
Shigetomo Nunomura
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| in spite of the advantages of instrumented charpy impact test, there are only few cases in which the quantitative results is used in the actual structure design becuse the quantitative result is thought to be unreliable. the accuracy of the impact load measuring system was studied. the use of a transient recorder instead of a synchroscope gave highly accurate results. the frequency responses of the load measuring systems to determine ... |
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| on practicality of plane strain fracture toughness measurement using small size specimens |
75 |
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| Authors:
Shigetomo Nunomura
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| the astm recommends the plane strain fracture toughness testing for materials of low to medium strength. according to the recommendation, the specimens are to have the specified thickness and some initial crack length. this is not only uneconomical but unrealistic because often no such specimen can be made or no testing equipment has enough capacity to meet the specification. some experimental results indicate that the astm recommendation for some valid ... |
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Reports by Author
