{"id":607775,"date":"2024-11-05T22:38:55","date_gmt":"2024-11-05T22:38:55","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/iso-228892013\/"},"modified":"2024-11-05T22:38:55","modified_gmt":"2024-11-05T22:38:55","slug":"iso-228892013","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/iso\/iso-228892013\/","title":{"rendered":"ISO 22889:2013"},"content":{"rendered":"

ISO 22889:2013 specifies methods for determining the resistance to stable crack extension in terms of crack opening displacement, d<\/i>5<\/sub>, and critical crack tip opening angle, ?<\/i>c<\/sub>, for homogeneous metallic materials by the quasistatic loading of cracked specimens that exhibit low constraint to plastic deformation. Compact and middle-cracked tension specimens are notched, precracked by fatigue, and tested under slowly increasing displacement.<\/p>\n

ISO 22889:2013 describes methods covering tests on specimens not satisfying requirements for size-insensitive fracture properties; namely, compact specimens and middle-cracked tension specimens in relatively thin gauges.<\/p>\n

Methods are given for determining the crack extension resistance curve (R-curve). Point values of fracture toughness for compact specimens are determined according to ISO 12135. Methods for determining point values of fracture toughness for the middle-cracked tension specimen are given.<\/p>\n

Crack extension resistance is determined using either the multiple-specimen or single-specimen method. The multiple-specimen method requires that each of several nominally identical specimens be loaded to a specified level of displacement. The extent of ductile crack extension is marked and the specimens are then broken open to allow measurement of crack extension. Single-specimen methods based on either unloading compliance or potential drop techniques can be used to measure crack extension, provided they meet specified accuracy requirements. Recommendations for single-specimen techniques are described in ISO 12135. Using either technique, the objective is to determine a sufficient number of data points to adequately describe the crack extension resistance behaviour of a material.<\/p>\n

The measurement of d<\/i>5<\/sub> is relatively simple and well established. The d<\/i>5<\/sub> results are expressed in terms of a resistance curve, which has been shown to be unique within specified limits of crack extension. Beyond those limits, d<\/i>5<\/sub> R-curves for compact specimens show a strong specimen dependency on specimen width, whereas the d<\/i>5<\/sub> R-curves for middle-cracked tension specimens show a weak dependency.<\/p>\n

CTOA is more difficult to determine experimentally. The critical CTOA is expressed in terms of a constant value achieved after a certain amount of crack extension. The CTOA concept has been shown to apply to very large amounts of crack extension and can be applied beyond the current limits of d<\/i>5<\/sub> applications.<\/p>\n

Both measures of crack extension resistance are suitable for structural assessment. The d<\/i>5<\/sub> concept is well established and can be applied to structural integrity problems by means of simple crack driving force formulae from existing assessment procedures.<\/p>\n

The CTOA concept is generally more accurate. Its structural application requires numerical methods, i.e. finite element analysis.<\/p>\n

Investigations have shown a very close relation between the concept of constant CTOA and a unique R-curve for both compact and middle-cracked tension specimens up to maximum load. Further study is required to establish analytical or numerical relationships between the d<\/i>5<\/sub> R-curve and the critical CTOA values.<\/p>\n","protected":false},"excerpt":{"rendered":"

Metallic materials \u2014 Method of test for the determination of resistance to stable crack extension using specimens of low constraint<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ISO<\/b><\/a><\/td>\n2013-10<\/td>\n56<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":607788,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1088,2634],"product_tag":[],"class_list":{"0":"post-607775","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-77-040-10","7":"product_cat-iso","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/607775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/607788"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=607775"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=607775"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=607775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}