modify wiki

wiki/concepts/Finite Element Method.md

@@ -7,7 +7,7 @@ aliases:
   - FEM
   - finite element analysis
 created: 2026-05-28
-updated: 2026-05-28
+updated: 2026-05-29
 address: c-000006
 tags:
   - concept
@@ -22,11 +22,18 @@ related:
   - "[[Isoparametric Linear Solid Elements]]"
   - "[[Continuum Mechanics Based Four-Node Shell Element]]"
   - "[[On-the-Finite-Element-Analysis-of-Shell-Structures]]"
+  - "[[Abaqus Theory Manual]]"
+  - "[[Abaqus Element Library]]"
+  - "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
+  - "[[Direct Stiffness Method]]"
+  - "[[Finite Element Modeling and Convergence Checks]]"
 sources:
   - "[[Finite Element Procedures]]"
   - "[[A Continuum Mechanics Based Four-Node Shell]]"
   - "[[On-the-Finite-Element-Analysis-of-Shell-Structures]]"
   - "[[Solid Element Notes]]"
+  - "[[Abaqus Theory Manual]]"
+  - "[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]"
 ---
 
 # Finite Element Method
@@ -49,13 +56,20 @@ The shell FE review reinforces the same modeling-first point: shell results requ
 
 [[Solid Element Notes]] adds a compact element-level derivation for 3D continuum elements: natural-coordinate shape functions, Jacobian derivative mapping, `B` and `D` matrices, stiffness integration, and incompatible mode enrichment.
 
+[[Abaqus Theory Manual]] adds an industrial reference layer: it shows how finite element theory is organized inside a production analysis system through procedures, element libraries, material-point updates, contact, constraints, and coupled-field analyses.
+
+[[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]] adds a pedagogical layer: it walks the method from springs and bars to trusses, beams, frames, plane elements, axisymmetric elements, isoparametric elements, heat transfer, thermal stress, and dynamics.
+
 ## Key Connections
 
 - [[Engineering Mathematical Models]] defines what is being solved.
 - [[Displacement-Based Finite Element Formulation]] gives the main solid mechanics derivation.
 - [[Isoparametric Finite Elements]] describes practical element construction.
+- [[Direct Stiffness Method]] shows the basic matrix assembly workflow.
+- [[Finite Element Modeling and Convergence Checks]] captures practical mesh and result checks.
 - [[Continuum Mechanics Based Four-Node Shell Element]] is a focused low-order shell formulation example.
 - [[Static Equilibrium Equation Solvers]], [[Direct Time Integration Methods]], and [[Finite Element Eigenproblem Solvers]] solve the resulting systems.
+- [[Abaqus Element Library]] and [[Abaqus Analysis Procedures]] show how those ideas are packaged in a general-purpose FE code.
 
 ## Sources
 
@@ -63,3 +77,5 @@ The shell FE review reinforces the same modeling-first point: shell results requ
 - [[A Continuum Mechanics Based Four-Node Shell]]
 - [[On-the-Finite-Element-Analysis-of-Shell-Structures]]
 - [[Solid Element Notes]]
+- [[Abaqus Theory Manual]]
+- [[A-First-Course-in-the-Finite-Element-Method|A First Course in the Finite Element Method]]