{"id":6527,"date":"2019-08-21T12:31:05","date_gmt":"2019-08-21T12:31:05","guid":{"rendered":"https:\/\/www.istp.cnr.it\/?post_type=product&#038;p=6527"},"modified":"2022-06-21T09:57:17","modified_gmt":"2022-06-21T09:57:17","slug":"creep-fatigue-design-rules-for-cyclic-softening-steels","status":"publish","type":"product","link":"https:\/\/www.istp.cnr.it\/it\/research-product\/creep-fatigue-design-rules-for-cyclic-softening-steels\/","title":{"rendered":"Creep-fatigue design rules for cyclic softening steels"},"content":{"rendered":"<p>Based on existing lifetime and damage models a new approach is developed for the assessment of creep-fatigue lifetime of components made out of cyclic softening steel, in particular EUROFER97. For the application of the new creep-fatigue rules among others lifetime data from special tests, in particular creep tests on pre-fatigued specimens are required. Therefore, a test matrix is proposed and conducted for EUROFER97 in which the efforts are minimized by utilizing the Monkman-Grant relationship and its independence on pre-cyclic deformation, and cyclic softening, respectively. To facilitate their implementation in existing design criteria the new creep-fatigue rules are simplified by introducing the cyclic softening stress factor with which the impact of cyclic softening on creep rupture time is considered. The assessment of creep-fatigue in LCF tests with hold-times performed on EUROFER97 using the new rules demonstrates their applicability to cyclic softening ferritic-martensitic steels without being overly conservative. A draft for implementing the simplified rules in the respective chapter of structural design code is elaborated in addition.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aktaa J.; Walter M.; Angella G.; Perelli Cippo E.<\/p>\n","protected":false},"featured_media":1294,"comment_status":"closed","ping_status":"open","template":"","meta":[],"product_cat":[574],"product_tag":[843,844,845,846,847],"class_list":["post-6527","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-journal-articles","product_tag-eurofer97","product_tag-creep-fatigue","product_tag-cyclic-softening","product_tag-design-rules","product_tag-failure","prodpage-style2"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product\/6527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/comments?post=6527"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media?parent=6527"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_cat?post=6527"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_tag?post=6527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}