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Determination of mechanical properties by using universal testing facilities

Structural compon­ents are exposed to mech­an­ical stress, which requires a compre­hens­ive char­ac­ter­iz­a­tion of the mech­an­ical prop­er­ties. Thus compon­ents can be tailored for their inten­ded use. We can determ­ine the follow­ing import­ant key figures for the designer.

• stiff­ness, strength, toughness
• damage toler­ance against cracks, notches and mater­ial defects
• mech­an­ical beha­viour at differ­ent temperatures
• relax­a­tion, creep, hysteresis

All tests are performed on a calib­rated univer­sal test­ing device in accord­ance with accep­ted stand­ards (DIN, ASTM, EN and ISO). The force-displace­ment diagrams are recor­ded using a PC and analyzed with soft­ware specially developed for this purpose.

Temperature ranges
for tensile tests	-150 °C to +1000 °C, at -196 °C (LN2) and at -269°C (LHe)
for compres­sion tests	-150 °C to +800 °C, at -196 °C (LN2) and at -269°C (LHe)
for bend­ing tests	-150 °C to +1100 °C, at -196 °C (LN2) and at -269°C (LHe)
frac­ture mechanics	-150 °C to +1100 °C, at -196 °C (LN2) and at -269°C (LHe)

Tensile and compression tests

• Determination of mech­an­ical parameters
• Investigation of temper­at­ure behavior
• Force sensors for differ­ent force ranges available
• High-resol­u­tion, non-contact extens­o­meter in use

Bending tests

• three-point bend­ing tests on injec­tion molded parts and fibre-rein­forced composites
• Interlaminar shear strength of long fiber-rein­forced plastics
• Four-point bend­ing test of compact mater­i­als and sand­wich structures

Varying moment curve at 3-point- and 4-point-bend­ing test
(M=bending moment, IA=span lenght, Lv=effective span)

Determination of the critical stress intensity factor

Force-crack open­ing curve
Crack growth starts at fors FQ

• char­ac­ter­iz­a­tion of damage toler­ance to defects
• determ­in­a­tion of the E-modulus
• by normal­iz­a­tion to the sample geometry, mater­ial-specific para­met­ers are provided

Interlaminar fracture toughness

• prob­ab­il­ity of defects in fibre-rein­forced plastics is higher than in homo­gen­eous plastics
• the criteria of linear elastic frac­ture mech­an­ics are not valid for fibre-rein­forced plastics
• energy release rate char­ac­ter­izes the strength of the material