Click Additional criterions to stop analysis in the Non-linear Analysis Algorithm Options dialog to execute non-linear analysis with a user defined increment of the load parameter.
In the standard non-linear analysis, the load is applied with the increment dλ = 1.0 / X, where X - number of load increments. Consequently, the maximum possible load factor (λ) which may be reached for convergent calculations, equals λ max =1.0.
The maximum load factor λ max is indefinite or may be defined by the user.
The following criterions which stop analysis are available:
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1A. The Structure Collapse Criterion
Analysis performs until the divergence of the iterative process is reached.
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1B. The Criterion of Reaching Load Factor
Analysis performs until the value λ max = λ def (user defined) is obtained or until the divergence of the iterative process is reached. The analysis is stops if one of the conditions occurs.
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2A. The Plasticity State Criterion
Analysis performs until the plasticity state is started at any point of the section of at least one elasto-plastic element or until the divergence of the iterative process is obtained. The analysis stops if one of the conditions occurs.
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2B. The Criterion of Reaching Plasticity Rate
Analysis performs until the plasticity state of any elasto-plastic element reaches the limit value of the user defined plasticity state (SL max >0) or until the divergence of the iterative process is obtained. The analysis stops if one of the conditions occurs.
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3A. The Criterion of Exceeded Maximum Displacement of Any Node
Analysis performs until the value of maximum displacement of any node exceeds the user defined allowable displacement (>0) or until the divergence of the iterative process is reached. The analysis stops if one of the conditions occurs.
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3B. The Criterion of Exceeded Maximum Displacement of a Selected Node
Analysis performs until the value of maximum displacement of a selected node exceeds user defined allowable displacement (>0) or until the divergence of the iterative process is reached. The analysis stops if one of the conditions occurs.
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4A. The Criterion of Reaching a Value of Total Strains
Analysis performs until the value of total strains (absolute value of a strain value, the value of tension strains or compression strains) reaches a user defined value or until the divergence of the iterative process is obtained. The analysis stops if one of the conditions occurs.
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4B. The Criterion of Reaching a Value of Plastic Strains
Analysis performs until the value of plastic strains (the absolute value of a strain value, the value of tension strains or compression strains) reaches a user defined value or until the divergence of the iterative process is obtained. The analysis stops if one of the conditions occurs.
It is possible to define more than one criterion of stopping the analysis. However, the definition is limited to one criterion from a given group, i.e. 1, 2 or 3. Thus you may select for example 1A, 2A, 3B, but the definition 1A, 1B or 2A, 2B or 3A, 3B is not allowed.