LS-DYNA Blast Load Failure Analysis
Budget: ₹600 – ₹1,500 INR
This project centres on building and running a full-scale LS-DYNA model that recreates an air blast acting on an NRC-type concrete structure. Unlike standard studies that stop at pressure plots or global displacement charts, the brief digs into a different, very specific aspect of the phenomenon (classified as “other” in the scoping question) so that the end result directly supports a detailed failure analysis.
Scope of work
• Develop an accurate 3-D concrete model using the material cards best suited to blast and fracture behaviour.
• Apply a realistic time-dependent air-blast load that reflects the scenario parameters I will provide (charge mass, stand-off, waveform, etc.).
• Calibrate the model so numerical damping or mesh size does not mask true failure modes.
• Run the simulation through to first local failure and capture progressive damage until global instability is evident.
• Post-process the run in LS-PrePost (or equivalent) and deliver contour plots, time-histories, and a short technical memo highlighting the critical failure sequence.
Acceptance criteria
1. Input deck runs in LS-DYNA R12 (double precision) without error.
2. Energy balance within ±3 % at end of event.
3. Memo clearly identifies the governing failure mechanism and correlates it to the stress/strain history in the concrete.
4. All result files and keyword decks are packaged so future reruns are turnkey.
Only concrete material is involved; reinforcing steel or composite liners are intentionally excluded at this stage, keeping the model lean and the failure interpretation unambiguous.
Please allow for two quick review loops so I can confirm the “other” focus area has been captured correctly before sign-off.
Scope of work
• Develop an accurate 3-D concrete model using the material cards best suited to blast and fracture behaviour.
• Apply a realistic time-dependent air-blast load that reflects the scenario parameters I will provide (charge mass, stand-off, waveform, etc.).
• Calibrate the model so numerical damping or mesh size does not mask true failure modes.
• Run the simulation through to first local failure and capture progressive damage until global instability is evident.
• Post-process the run in LS-PrePost (or equivalent) and deliver contour plots, time-histories, and a short technical memo highlighting the critical failure sequence.
Acceptance criteria
1. Input deck runs in LS-DYNA R12 (double precision) without error.
2. Energy balance within ±3 % at end of event.
3. Memo clearly identifies the governing failure mechanism and correlates it to the stress/strain history in the concrete.
4. All result files and keyword decks are packaged so future reruns are turnkey.
Only concrete material is involved; reinforcing steel or composite liners are intentionally excluded at this stage, keeping the model lean and the failure interpretation unambiguous.
Please allow for two quick review loops so I can confirm the “other” focus area has been captured correctly before sign-off.