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It is shown that the effective fracture toughness governs the load-bearing capacity of a cracked full-scale structure.
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Experimental results obtained with an inhomogeneous ordinary structural steel which support the blend rule are presented. It is now derived from a general case by considering material elements of finite size and of different toughness along and around the tip of a crack.
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The blend rule for the effective fracture toughness of a layered material was originally derived from the special case of a through crack in a globally elastic material and later extended to accomodate non-linear behaviour. International Nuclear Information System (INIS)
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The effective fracture toughness of structural components obtained with the blend rule At age 14, and relative to males, females had lower MT scores and reported more sleep disturbance.Conclusions: The pattern of results suggests that mental toughness traits during adolescence may have their origins in the pre-school years. At age 14, and relative to males, females had lower MT scores and reported more sleep disturbances.Results: Higher prosocial behavior, lower negative peer relationships, and lower internalizing and externalizing problems at age five, as rated by parents and teachers, predicted self-reported higher mental toughness and lower sleep disturbances at age 14. At follow-up, participants completed a booklet of questionnaires covering socio-demographic data, mental toughness, and sleep disturbances.Results: Higher prosocial behavior, lower negative peer relationships, and lower internalizing and externalizing problems at age five, as rated by parents and teachers, were associated with self-reported higher mental toughness and lower sleep disturbances at age 14. At baseline, both parents and teachers completed the Strengths and Difficulties Questionnaire (SDQ, covering internalizing and externalizing problems, hyperactivity, negative peer relationships, and prosocial behavior. Therefore, the aims of the present study were: to explore, to what extent the psychological profiles of preschoolers aged five were associated with both 1 mental toughness scores and 2 sleep disturbances at age 14, and 3 to explore possible gender differences.Method: Nine years after their first assessment at age five (preschoolers, a total of 77 adolescents (mean age: 14.35 years SD = 1.22 42% females took part in this follow-up study. However, no study has focused so far on the psychological origins of mental toughness. The origins of mental toughness – prosocial behavior and low internalizing and externalizing problems at age 5 predict higher mental toughness scores at age 14ĭirectory of Open Access Journals (Sweden)įull Text Available Background: The concept of mental toughness has gained increasing importance among groups other than elite athletes by virtue of its psychological importance and explanatory power for a broad range of health-related behaviors. This information can then be applied to structural integrity assessment. In this work, fracture toughness tests such as J value representing a conservative estimate of the mean fracture toughness is obtained (with its probability distribution). These techniques are applied in the Leak-Before-Break (LBB) concept that is accepted for designing the piping system of the primary circuit of the pressurized water reactor (PWR). This information allows equipment to be used longer with a high degree of safety. The fracture toughness parameters are applied to estimate the lifetime of mechanical components and define the criteria of safe failure and tolerable damages. Gomes Junyor, José Onésimo Faria, Stéfanno Bruno Rocha, Nirlando Antônio Reis, Emil Vilela, Jefferson José, E-mail: E-mail: E-mail: E-mail: E-mail: [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil) Centro Universitário de Belo Horizonte (UNIBH), MG (Brazil) Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil) Assessment of fracture toughness of structural steelsĮnergy Technology Data Exchange (ETDEWEB)