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The specimens were of three types: smooth specimen, specimen with an artifical surface defect of 0.2 mm in diameter, and specimen with an artifical through-thickness defect of 2 mm in length. In smooth specimens, a fatigue crack started from natural defects of about 0.15 mm in size, and grew as an internal crack, and then became a through-thickness crack. The spring constant of the specimen decreased slowly in the range of about 80\uff05 of the total life (Stage A), followed by a rapid decrease (Stage B). The transition from Stage A to B took place when a crack penetrated through the thickness. The rate of fatigue crack propagation is expressed as a second-power function of the J-integral range both for surface cracks and through-thickness cracks. The J-integral was evaluated from the crack-center opening displacement.", "subitem_description_type": "Abstract"}]}, "item_10_identifier_60": {"attribute_name": "URI", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/2237/9154"}]}, "item_10_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u65e5\u672c\u6a5f\u68b0\u5b66\u4f1a"}]}, "item_10_relation_43": {"attribute_name": "\u7570\u7248\u3067\u3042\u308b", "attribute_value_mlt": [{"subitem_relation_type": "isVersionOf", "subitem_relation_type_id": {"subitem_relation_type_id_text": "http://ci.nii.ac.jp/naid/110002370370/", "subitem_relation_type_select": "URI"}}]}, "item_10_rights_12": {"attribute_name": "\u6a29\u5229", "attribute_value_mlt": [{"subitem_rights": "\u65e5\u672c\u6a5f\u68b0\u5b66\u4f1a"}, {"subitem_rights": 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"Other"}, {"subitem_subject": "Smooth Specimen", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Natural Defect", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Artificial Surface Defect", "subitem_subject_scheme": "Other"}, {"subitem_subject": "Through-thickness Crack", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "jpn"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "\u9632\u632f\u30b4\u30e0\u6750\u6599\u306b\u304a\u3051\u308b\u75b2\u52b4\u304d\u88c2\u9032\u5c55\u6319\u52d5\u3078\u306eJ \u7a4d\u5206\u306e\u9069\u7528", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": 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