NSTX CSUTesting

Flex Strap Conductor

Initial Material Fatigue Testing

Material

• Manufacture PMX Industries• Manufacture Alloy # 151• ASTM Specification B747• USN/CDA # C15100• Material Section 4” x 0.077”• Hardness H04

Manufacture’s PublishedMaterial Specifications

• Hardness: H04 (Hard)• Chemistry: Copper (99.8%)

Zirconium (0.1%)• Density: 0.323 lb/in3 • Modulus of Elasticity: 17 x 106 psi• Electrical Conductivity: 95% I.A.C.S. @68oF• Thermal Conductivity: 208 Btu/ft-hr-oF @ 68oF• Coef. Therm. Expan.: 9.8 x 106 in/in-oF• Tensile Strength: 53-62 Ksi• Yield Strength: 56 Ksi

Test Samples

• Specimen Specification ASTM E 8• Specimen Type Rectangular Tension• Specimen Size 1/4-in Subsize• Material Orientation Longitudinal (six samples) &

Transverse (seven samples)

Test Parameters

• Test Method Plain-Strain Fracture Toughness• Test Spec. ASTM E 399• Load Cycle:

– Function: Sin

– Rate: 1 Hz

– Ratio: 10% to 100% (R=0.1)

# Samples Orientation Peak Stress Peak Load Max. Cycles Test Time

3 transverse 55 Ksi ~1060 lb 10,000 ~3 hr

3 longitudinal 55 Ksi ~1060 lb 10,000 ~3 hr

3 transverse 37 Ksi ~707 lb 100,000 ~28 Hr

3 longitudinal 37 Ksi ~707 lb 100,000 ~28 hr

Test Procedure

• Measure and record the dimensions of each sample• Measure and record the hardness of each sample• Mark sample with gauge length points• Configure Test fixture for E399 tension test• Configure testing program and verify operation with extra

sample• Install and tension cycle each sample• Record number of cycles to failure or, if no failure, any

change in gauge length