add wiki

wiki/concepts/Abaqus Element Library.md

@@ -4,7 +4,7 @@ title: "Abaqus Element Library"
 complexity: advanced
 domain: computational-mechanics
 created: 2026-05-29
-updated: 2026-05-29
+updated: 2026-06-01
 address: c-000056
 aliases:
   - ABAQUS element library
@@ -18,7 +18,12 @@ status: current
 related:
   - "[[Abaqus Theory Manual]]"
   - "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
+  - "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
   - "[[ABAQUS]]"
+  - "[[Abaqus Element Selection and Formulation]]"
+  - "[[Abaqus Continuum Element Families]]"
+  - "[[Abaqus Structural Element Families]]"
+  - "[[Abaqus Element Indexes and Naming Conventions]]"
   - "[[Abaqus Spatial Model Definition]]"
   - "[[Abaqus Surface and Assembly Modeling]]"
   - "[[Isoparametric Finite Elements]]"
@@ -28,6 +33,7 @@ related:
 sources:
   - "[[Abaqus Theory Manual]]"
   - "[[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]"
+  - "[[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]"
 ---
 
 # Abaqus Element Library
@@ -44,16 +50,22 @@ The library includes continuum solids, infinite elements, membranes, trusses, be
 
 The user guide adds the input-file side of the library: an element definition pairs an element number and connectivity with an element type, then uses element sets, sections, surfaces, and assembly instances to connect that formulation to materials, loads, constraints, and output.
 
+[[Abaqus-Analysis-User-s-Guide-Volume-IV|Volume IV]] adds the selection side of the library. It organizes elements by family, active degrees of freedom, number of nodes, interpolation order, formulation, integration rule, section requirements, and product availability.
+
 ## Formulation Choices
 
 - Full integration improves rank and suppresses zero-energy modes but may lock in bending or incompressible limits.
 - Reduced integration can lower cost and improve some strain estimates but may introduce hourglass modes.
 - Selective reduced integration and hybrid elements address volumetric locking and incompressibility.
 - Second-order elements are often preferred for smooth elliptic problems, while first-order or enriched elements are common in localization, contact, and severe nonlinearity.
+- Element names encode practical choices: `R` commonly marks reduced integration, `H` marks hybrid pressure treatment, and family prefixes identify continuum, shell, beam, connector, cohesive, acoustic, Eulerian, and particle elements.
 
 ## Connections
 
 - [[Isoparametric Finite Elements]] gives the common mapping and interpolation language.
+- [[Abaqus Element Selection and Formulation]] explains how family, degrees of freedom, interpolation, formulation, and integration become a concrete element choice.
+- [[Abaqus Continuum Element Families]] and [[Abaqus Structural Element Families]] split the largest element families by modeling abstraction.
+- [[Abaqus Element Indexes and Naming Conventions]] decodes the element-name and product-availability lookup layer.
 - [[Reduced Integration and Hourglass Control]] explains the main under-integration tradeoff.
 - [[Hybrid Incompressible Elements]] explains the mixed treatment used when displacement-only elements become too stiff.
 - [[Solid Element Stiffness Integration]] is the local stiffness assembly case for three-dimensional continuum elements.
@@ -64,3 +76,4 @@ The user guide adds the input-file side of the library: an element definition pa
 
 - [[Abaqus Theory Manual]]
 - [[Abaqus-Analysis-User-s-Guide-Volume-I|Abaqus Analysis User's Guide Volume I]]
+- [[Abaqus-Analysis-User-s-Guide-Volume-IV|Abaqus Analysis User's Guide Volume IV]]