本研究では，減肉を有する立体配管系を対象として，地震荷重下で減肉の存在が配管系の振動応答および破損挙動に与える影響をパラメトリック解析により調査した．過去に実施された実験結果を再現できる解析モデルを構築し，数値解析の妥当性を検討するとともに，エルボ部の面外曲げと面内曲げの2 つの曲げモードに着目しラチェット変形を考慮した疲労寿命評価を実施した．解析の結果，以下のことが明らかとなった．（1 ）減肉率が増加するほど剛性が低下し，振動数が低下することによりひずみサイクル数は減少するが，変位量の増加により疲労損傷は大きくなる．（2 ）内圧の増加にともない，面外曲げを受ける減肉エルボではラチェットひずみが増加し，疲労寿命が低下する．（3 ）面外曲げにおいては局部減肉部の局所的な変形によって全周減肉よりも疲労寿命が大きく低下する可能性がある．
","subitem_description_language":"ja","subitem_description_type":"Other"},{"subitem_description":"This study presents parametric analysis for fatigue assessment and dynamic responses of three-dimensional wallthinned piping systems subjected to seismic loadings. Validated finite element models were constructed based on the wallthinned piping system reported in the previous paper. Fatigue lives for in-plane and out-of-plane bending modes are assessed with the effect of ratchet deformations. The obtained results are summarized as follows:(i) Stiffness of piping and number of strain cycles decrease with the increase in the fraction of wall thinning, (ii) Internal pressure affects the increase in ratchet strain and the fatigue lives decrease, (iii) The fatigue life of local wall thinning is not always safe compared with full circumferential thinning.
","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_10001_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"安全工学会","subitem_publisher_language":"ja"},{"subitem_publisher":"Japan Soceiety for Safety Engineering","subitem_publisher_language":"en"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"10.18943/safety.52.5_300"}}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0570-4480","subitem_source_identifier_type":"ISSN"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"中垣 真美","creatorNameLang":"ja"},{"creatorName":"NAKAGAKI Mami","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"澁谷 忠弘","creatorNameLang":"ja"},{"creatorName":"SHIBUTANI Tadahiro","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"中村 いずみ","creatorNameLang":"ja"},{"creatorName":"NAKAMURA Izumi","creatorNameLang":"en"}]},{"creatorNames":[{"creatorName":"大谷 章仁","creatorNameLang":"ja"},{"creatorName":"OTANI Akihito","creatorNameLang":"en"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_title":"地震荷重下における減肉配管系のパラメトリック数値解析による疲労損傷評価","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"地震荷重下における減肉配管系のパラメトリック数値解析による疲労損傷評価","subitem_title_language":"ja"},{"subitem_title":"Fatigue damage assessment of piping systems having wall thinning under seismic load by parametric numerical analysis","subitem_title_language":"en"}]},"item_type_id":"40001","owner":"1","path":["1670839190650"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2023-03-30"},"publish_date":"2023-03-30","publish_status":"0","recid":"5408","relation_version_is_last":true,"title":["地震荷重下における減肉配管系のパラメトリック数値解析による疲労損傷評価"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-03-31T02:30:17.226947+00:00"}