Testing ASTM D638 test specimen

Tensile properties of the blends were measured according to ASTM standard D638-84 [ 11] using type I specimens which were cast in a manner identical to that used to prepare DMA test specimens. The specimens were polished to a 1 jum finish on all surfaces and stored in a desiccator until tested. 

ASTM standard specimens and procedures were used for flexure (D-690), compression (D 695), Izod impact and torsional pendulum analysis (TPA). For tension, D1822 tensile impact specimens were substituted for D638 specimens to conserve material. Test specimens were machined from the plates and cylinders using a water cooled dlamond wheel. All the specimens were dried in vacuo at 100°C for three weeks before testing or subsequent postcure treatment. Half the specimens were post-cured for 2 hours at 225°C in vacuo before testing. Selected specimens were Immersed in distilled water at 80°C for 6 weeks for moisture uptake determinations. 

Tensile properties are one of the most important single indications of the strength of a material. Mechanical properties of polymeric materials are often measured using standard test sample configurations. In these studies, a tensile dumbbell-shaped test specimen which conforms to ASTM D638 was used for all measurements. 

Bulk samples were cured at 125 °C for 1 h, followed by 177 °C for 2 h, and finally 220 °C for 1 h. Fracture-toughness tests on bulk samples were performed according to the ASTM E399-83 procedure using compact-tension specimens with a thickness of 6.35 mm. Tensile tests were performed following ASTM D638-86. Both tests were run at a 50-mm/min jaw speed. Adhesive formulations were blend-... 

TPU, Thermoplastic polyurethane, Estane 58111, Goodrich POM polyoxymethylene, Celcon M 140, Hoechst Celanese. Test specimens were prepared according to ASTM D638 and D648. 

ASTM D638 Standard Test Method for Tensile Properties of Plastics is used to determine the tensile properties of unreinforced and reinforced plastics under defined conditions of pretreatment, temperature, humidity, and testing machine speed. Specimens are dumbbell-shaped and can be of any thickness up to 14 mm. However, test Method D8 82 is the preferred test method for testing films... 

Figure 5.49 Stress vs. strain detail in tension at 23°C tested on ASTM D638 type 1 specimens for Solvay Advanced Polymers Torlon PAI resins [5],...

The specimens used in these tests were standard ASTM "dogbone" specimens cast to shape (ASTM D638-72, Type I Specimen). Apart from the specimens that were tensile tested, evaluations were also made of thermal shock behavior. 

Tensile tests were conducted using the ASTM D638 Type V technique at room temperature on dog bone-shaped specimens of 25 mm uge-length and 3 mm width. The specimens were 1 mm thick and were die-cut into the ASTM dog bone shape. An ATS Universal 900 tensile tester at a cross-head speed of 25 mm/min was used to test six replicates per nanocomposite type. 

The tensile properties of the specimens were measured according to ASTM D638. The chord tensile modulus (0.05-0.25% strain) and tensile strength at yield were determined at the crosshead speed of 5 mm/min and 50 mm/min. More than ten specimens were tested with the calculated mean values and standard deviations used in the final results. 

II 12 49 9 Tested 6 months after exposure retains 98% of dart impact 85 88 Tensile strength per ASTM D638-84 10 mil notched Izod per ASTM D256-84 Dowlex 2535 Dow Chemical Specimen Preconditioned 38°C for 8 hrs aerated 16 hrs 32°C... 

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