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发表于 2018-1-8 10:46:49
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容器设计标准是按照AMSE VIII Div 1,局部按照ASME VIII Div 2进行温度疲劳试验分析是允许的。
一般按照ASME VIII DIV.1 的U-2(g),
This Division of Section VIII does not contain rules to cover all details of design and construction. Where complete details are not given, it is intended that the Manufacturer, subject to the acceptance of the Inspector, shall provide details of design and construction which will be as safe as those provided by the rules of this Division.
U-2(g) allows the user to pick any reasonable method for fatigue analysis.Most calculations use ASME VIII-II Part 5.当然按其它适用的方法也是允许的。
https://becht.com/blog/performing-an-fea-in-section-viii-division-1-to-qualify-an-article-u-2-g-component
there is some pretty decent guidance in API 579/ASME FFS-1.
The allowable stress for all product forms except bolting needs to be from Section II, Part D, Table 1 and Table 1A (i.e. the allowable stress for Section VIII Division 1 construction).
For bolting materials the allowable stress needs to be determined from Section II, Part D, Table 3.
Limiting values that are not calculated using the allowable stress, S, such as fatigue and compressive allowable stresses, can be determined from the current rules in Section VIII Division 2.
The weld joint efficiency needs to be established in accordance with UW-11 and UW-12 of Section VIII Division 1. (more on this item in another post)
The Design By Analysis Rules in ASME Section VIII, Division 2, Part 5 should be followed. This is only possible for temperatures not in the creep regime. If your vessel has operating temperatures into the creep regime (indicated by the allowable stress being in italics in Table 1 or Table 1A), I would suggest that you retain the services of an expert, because there are NO rules right now for that situation.
ALL of the load case combinations of the applicable Division 2 assessment procedure need to be considered in addition to any other combinations defined by the User. In evaluating load cases involving the pressure term, P, the effects of the pressure being equal to zero needs to be considered (this ought to be standard practice of anyone using Part 5, but it is worth stating, again).
All of failure mechanisms in 5.2, 5.3, 5.4, and 5.5 of Part 5 need to be evaluated. In 5.3, a component is exempt from the Local Failure Criteria evaluation if the component design is in accordance with the standard details of Part 4. That said, there are many details permitted in Division 1 that are not permitted in Division 2. If the component being evaluated is not covered by a standard detail from Part 4, then an evaluation per 5.3 is required.
When elastic-plastic analysis is performed, the required load case combinations from ASME FFS-1/API-579 Table B1.4 Note 6 need to be used.
Evaluation of the test condition per paragraph 4.1.6.2 of Section VIII, Division 2 is not mandatory, but consideration of the test condition per UG-22(j) of Section VIII, Division 1 is mandatory.
All other requirements for construction need to comply with Section VIII, Division 1.
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