ReddRadar
Agent skill
abaqus-dynamic-analysis
Complete workflow for dynamic analysis. Use when user mentions impact, crash, drop test, transient, or time-varying response. Handles explicit and implicit dynamics.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/abaqus-dynamic-analysis
SKILL.md
Abaqus Dynamic Analysis Skill
This skill handles explicit and implicit dynamics for impact, crash, drop test, and transient response analysis.
When to Use This Skill
Route here when user mentions:
- Impact, crash, collision, drop test
- Transient response, time-varying response
- Shock loading, blast loading, explosive loading
- High-speed events, wave propagation
- "What happens when it hits..."
Route elsewhere:
- Natural frequency extraction →
/abaqus-modal-analysis - Static/constant loads →
/abaqus-static-analysis - Harmonic/sinusoidal response → modal + steady-state dynamics
- Very long transients (minutes+) → consider implicit or quasi-static
Prerequisites
Before dynamic analysis:
- Geometry and mesh ready
- Material MUST have density defined (required for mass matrix)
- Understand event duration and loading type
Workflow: Setting Up Dynamic Analysis
Step 1: Gather Information from User
Ask if unclear:
- What's the event duration? Milliseconds, seconds, or longer?
- Initial velocity? For drop tests or impact
- Is contact involved? Parts colliding or touching
- What output needed? Stress, velocity, acceleration, energy?
Step 2: Choose Explicit vs Implicit
| Factor | Explicit | Implicit |
|---|---|---|
| Time scale | Short (us to ms) | Longer (ms to s) |
| Step size | Automatic (very small) | User-controlled |
| Nonlinearity | Handles well | May need iterations |
| Memory | Lower | Higher |
| Contact | Natural handling | Needs care |
| Best for | Impact, crash | Vibration, long transient |
Decision rule:
- Event < 10ms with impact/contact → Explicit
- Event > 100ms without severe nonlinearity → Implicit
- In between → Either can work, explicit often easier
Step 3: Set Time Period
| Event Type | Typical Duration |
|---|---|
| High-speed impact | 0.1-10 ms |
| Drop test | 1-100 ms |
| Blast loading | 1-50 ms |
| Seismic/vibration | 1-100 s |
Step 4: Define Initial Conditions
For drop tests and impact:
- Set initial velocity on the impacting part/region
- Velocity is applied in the Initial step
Step 5: Configure Output
Field outputs: S (stress), U (displacement), V (velocity), A (acceleration), PEEQ (plastic strain)
History outputs for energy balance (explicit): ALLKE, ALLIE, ALLWK, ETOTAL
Step 6: Consider Mass Scaling (Explicit Only)
| Option | Effect | When |
|---|---|---|
| None | True inertia | Very short events, accuracy critical |
| At beginning | Scale once | Quasi-static explicit |
| Throughout | Continuous scaling | When inertia less important |
Warning: Mass scaling speeds up analysis but affects inertial response.
Step 7: Run and Validate
Use /abaqus-job to submit, then check:
- Energy balance (ETOTAL approximately constant)
- Stable time increment (explicit)
- Results physically reasonable
Key Parameters
| Parameter | Explicit | Implicit |
|---|---|---|
| Time period | Event duration | Event duration |
| Time increment | Automatic | Specify initial, min, max |
| Element library | EXPLICIT | STANDARD |
| Element type | C3D8R recommended | C3D8R or C3D8 |
| Hourglass control | ENHANCED | Default |
Validation Checklist
- Density defined in material
- Time period appropriate for event
- Initial conditions applied (velocity, position)
- Output frequency captures behavior (100+ frames typical)
- Energy balance acceptable (ETOTAL constant for explicit)
- Results physically reasonable
Troubleshooting
| Problem | Likely Cause | Solution |
|---|---|---|
| "Time increment too small" | Small/distorted elements | Use mass scaling or coarsen mesh |
| Energy balance error | Hourglass or instability | Check hourglass energy, add control |
| Analysis takes forever (explicit) | Long time period | Consider implicit instead |
| Convergence failure (implicit) | Severe nonlinearity | Use explicit or smaller increments |
Related Skills
/abaqus-material- Define density (required)/abaqus-amplitude- Time-varying loads/abaqus-field- Initial velocity and predefined fields/abaqus-interaction- Contact for impact problems/abaqus-odb- Results extraction
Code Patterns
For API syntax and code examples, see:
- API Quick Reference
- Common Patterns
- Troubleshooting Guide
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