Test Method

Thick Adherend

Torsion Butt Joint

Napkin Ring

ENF

Mechanical Properties Obtained

Shear strength/modulus

Shear strength/modulus

Shear strength

Mode II fracture energies

Material Quantity Requirements/Specimen

Low

Low

Low

Low

Typical Specimen Dimensions (mm)

Length 110

Width 5

Adherend thickness 26

Overlap length 5

Diameter 15–25

Adherend thickness 12–15

Length 356

Width 25

Adherend thickness 6

Materials Suitable for Testing

1- 6

1—6

1—6

1 and 6

Cost of Specimen Fabrication/Preparation

Low-moderate

Low-moderate

Moderate-high

Low

Cost of Testing/Specimen

Low

Low-moderate

Low-moderate

Low-moderate

Specimen Fabrication Equipment Requirements

Surface preparation

Bonding = bonding jig

Surface preparation

Bonding + bonding jig

Surface preparation

Bonding + bonding jig

Surface preparation

Bonding + Bonding jig

Specimen Instrumentation Requirements

Extensometers (2 off)

Rotary extensometer

Rotary extensometer

Travelling microscope or video camera

Test Equipment and Fixture Requirements

Self-stressed

Universal test machine + loading fixture

Torsion test machine + loading fixture

Universal test machine + flexure fixture

Fatigue performance

Not suitable

Suitable

Suitable

Suitable

Creep Performance

Possibly

Suitable

Unsuitable

Unsuitable

Environmental suitability

Suitable

Suitable

Suitable

Suitable

Data Reduction

Straightforward

Straightforward

Straightforward

Straightforward

Accuracy (Estimated)

To be determined

To be determined

To be determined

Large uncertainty (30%)

Standard Test Methods Available

ISO 11003

ASTM D 3165

None

ASTM E 229

None