김경종
72 lines
2.9 KiB
Markdown
72 lines
2.9 KiB
Markdown
---
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type: concept
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title: "Midas NFX Material and Composite Models"
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created: 2026-06-02
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updated: 2026-06-02
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address: c-000176
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aliases:
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- NFX material models
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- NFX composite models
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tags:
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- concept
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- finite-element-method
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- midas-nfx
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- materials
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- composites
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status: current
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related:
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- "[[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]]"
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- "[[midas NFX]]"
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- "[[Finite Element Plasticity]]"
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- "[[Abaqus Material Library and Data Definition]]"
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- "[[Abaqus Progressive Damage and Failure]]"
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- "[[Midas NFX Element Library]]"
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sources:
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- "[[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]]"
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source_refs:
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- source: "[[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]]"
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raw_path: ".raw/MidasNFXAnalysisManual/"
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raw_files:
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- "MidasNFXAnalysisManual_002.md"
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- "MidasNFXAnalysisManual_015.md"
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md_indices:
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- 2
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- 15
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match: "heuristic-heading-keyword"
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confidence: low
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---
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# Midas NFX Material and Composite Models
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## Definition
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The NFX material-model thread covers the elastic, nonlinear, plastic, hyperelastic, thermal, viscoelastic, laminated-composite, and composite-failure behavior described in the [[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]].
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## Material Families
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The manual includes isotropic, orthotropic, anisotropic, and rigid elastic materials; nonlinear elastic material behavior; plastic material properties; hyperelastic behavior; thermal conductivity properties; age-independent and age-dependent viscoelasticity; and temperature-dependent material properties.
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## Composite Laminate Theory
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For laminated composites, the source gives the classic membrane-bending relation
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```text
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{N, M} = [[A, B], [B, D]] {epsilon_0, kappa}
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```
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where `A`, `B`, and `D` represent in-plane, coupling, and bending stiffness. The manual also includes transverse shear stiffness and thermal expansion terms for average temperature change and through-thickness temperature gradient.
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## Composite Failure
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The composite failure section covers maximum stress, maximum strain, Tsai-Hill, Hoffman, Tsai-Wu, and NASA LaRC02 criteria. The output concepts include finite-element failure index, failure index, and strength ratio.
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## Solver Development Use
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For a custom solver, this page points to two implementation layers: constitutive integration at integration points and laminate section integration through thickness. Composite failure should be treated as a postprocessing or damage-initiation contract unless the solver explicitly implements degradation, because a failure index alone does not define stiffness loss.
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## Connections
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- [[Finite Element Plasticity]] and [[Abaqus Constitutive Integration]] cover path-dependent material updates.
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- [[Abaqus Material Library and Data Definition]] and [[Abaqus Progressive Damage and Failure]] provide sibling commercial material/failure references.
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- [[Midas FEA Concrete Cracking and Material Models]] is a MIDAS sibling focused on civil concrete and interface material behavior.
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