Skill for planning and specifying mechanical material tests per ASTM standards
Plans mechanical material tests and specimen designs following ASTM standards.
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The Material Testing Planning skill provides capabilities for planning and specifying mechanical material tests per ASTM standards, enabling proper test specimen design, test matrix development, and data analysis for property determination.
Standard Specimens
| Type | Gauge Length | Gauge Width | Application |
|---|---|---|---|
| Sheet (flat) | 50 mm | 12.5 mm | Sheet/plate < 6 mm |
| Round | 50 mm | 12.5 mm dia | Bar/rod stock |
| Subsize | 25 mm | 6 mm | Limited material |
Specimen Preparation
Strain rate: 0.015 mm/mm/min (yield)
0.05-0.5 mm/mm/min (ultimate)
Temperature: Ambient (23 +/- 5 C) or specified
Extensometer: Class B-1 or better
| Method | Scale | Load | Application |
|---|---|---|---|
| Rockwell B | HRB | 100 kgf | Soft steel, copper |
| Rockwell C | HRC | 150 kgf | Hardened steel |
| Brinell | HB | 3000 kgf | Castings, forgings |
| Vickers | HV | 1-120 kgf | All materials |
| Knoop | HK | 10-1000 gf | Thin sections, coatings |
Surface Preparation
Spacing Requirements
Minimum indent spacing: 3 x indent diameter
Minimum edge distance: 2.5 x indent diameter
Minimum thickness: 10 x indent depth
Specimen Dimensions
Standard: 10 x 10 x 55 mm
Subsize: 10 x 7.5/5/2.5 x 55 mm
Notch: 45 degree V, 2 mm deep, 0.25 mm radius
Test Temperature
Properties Determined
Test Types
S-N Curve Development
Minimum 12-15 specimens for S-N curve
3 stress levels minimum
Runout at 10^6 or 10^7 cycles
Specimen Design
Test Parameters
| Purpose | Minimum Tests | Basis |
|---|---|---|
| Typical properties | 3 | Average |
| Design allowables (A-basis) | 100+ | 99%/95% confidence |
| Design allowables (B-basis) | 30+ | 90%/95% confidence |
| S-basis | 1 | Specification minimum |
Material: ____________
Specification: ____________
Heat/Lot: ____________
| Test Type | Orientation | Temperature | Specimens | Standard |
|-----------|-------------|-------------|-----------|----------|
| Tensile | L | RT | 3 | ASTM E8 |
| Tensile | T | RT | 3 | ASTM E8 |
| Hardness | Surface | RT | 5 loc | ASTM E18 |
| Impact | L-T | -40 C | 3 | ASTM E23 |
{
"material": {
"name": "string",
"specification": "string",
"heat_lot": "string",
"form": "plate|bar|forging|casting"
},
"test_requirements": {
"tensile": "boolean",
"hardness": "boolean",
"impact": "boolean",
"fatigue": "boolean"
},
"orientations": ["L", "T", "S"],
"temperatures": "array (C)",
"basis": "typical|A-basis|B-basis|S-basis",
"applicable_standards": "array"
}
{
"test_plan": {
"test_matrix": "array of test specifications",
"specimen_drawings": "array of references",
"total_specimens": "number",
"estimated_material": "number (kg)"
},
"specimen_requirements": {
"dimensions": "object",
"quantity": "number",
"preparation_notes": "string"
},
"test_procedures": "array of procedure references",
"data_analysis_plan": {
"properties_to_calculate": "array",
"statistical_methods": "array"
}
}
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