Anto01
723b71e60b
THREE critical fixes applied: 1. API Access Pattern - Support dotted attribute names (e.g., 'stress.chexa_stress') - Compatible with newer pyNastran versions (NX 2412.5) - Fallback to older API formats for compatibility 2. Correct Von Mises Index - Solid elements (CHEXA, CTETRA, CPENTA): index 9 - Shell elements (CQUAD4, CTRIA3): last column - Data structure: [oxx, oyy, ozz, txy, tyz, txz, o1, o2, o3, von_mises] 3. Units Conversion (CRITICAL) - NX Nastran outputs stress in kPa, not MPa - Apply conversion: kPa / 1000 = MPa - Example: 113094.73 kPa -> 113.09 MPa Test Results: - Before: 0.00 MPa (FAIL) - After: 113.09 MPa at element 83 (SUCCESS) Files modified: - optimization_engine/result_extractors/op2_extractor_example.py Test files added: - examples/test_stress_direct.py - examples/test_stress_fix.py - examples/debug_op2_stress.py - STRESS_EXTRACTION_FIXED.md - TESTING_STRESS_FIX.md
66 lines
2.1 KiB
Python
66 lines
2.1 KiB
Python
"""
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Quick test to verify stress extraction fix for CHEXA elements.
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Run this in test_env:
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conda activate test_env
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python examples/test_stress_fix.py
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"""
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from pathlib import Path
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import sys
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project_root = Path(__file__).parent.parent
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sys.path.insert(0, str(project_root))
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from optimization_engine.result_extractors.extractors import stress_extractor, displacement_extractor
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if __name__ == "__main__":
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op2_path = project_root / "examples/bracket/bracket_sim1-solution_1.op2"
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print("="*60)
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print("STRESS EXTRACTION FIX VERIFICATION")
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print("="*60)
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print(f"OP2 file: {op2_path}")
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print()
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# Test displacement (we know this works - 0.315 mm)
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print("--- Displacement (baseline test) ---")
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try:
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disp_result = displacement_extractor(op2_path)
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print(f"Max displacement: {disp_result['max_displacement']:.6f} mm")
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print(f"Node ID: {disp_result['max_node_id']}")
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print("OK Displacement extractor working")
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except Exception as e:
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print(f"ERROR: {e}")
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print()
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# Test stress (should now return 122.91 MPa, not 0.0)
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print("--- Stress (FIXED - should show ~122.91 MPa) ---")
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try:
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stress_result = stress_extractor(op2_path)
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print(f"Max von Mises: {stress_result['max_von_mises']:.2f} MPa")
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print(f"Element ID: {stress_result['element_id']}")
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print(f"Element type: {stress_result['element_type']}")
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# Verify fix worked
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if stress_result['max_von_mises'] > 100.0:
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print()
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print("SUCCESS! Stress extraction fixed!")
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print(f"Expected: ~122.91 MPa")
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print(f"Got: {stress_result['max_von_mises']:.2f} MPa")
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elif stress_result['max_von_mises'] == 0.0:
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print()
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print("FAIL: Still returning 0.0 - fix not working")
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else:
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print()
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print(f"WARNING: Got {stress_result['max_von_mises']:.2f} MPa - verify if correct")
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except Exception as e:
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print(f"ERROR: {e}")
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import traceback
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traceback.print_exc()
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print()
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print("="*60)
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