Instron tester

This project came into being because our laboratory has been asked to perform an ever-increasing number of tests with a fixed number of technologists, making it necessary for us to improve our productivity by automating as much of our operation as possible. Because our automated Instron tester can run unattended at all hours, we can... 

Stress-Strain Data. Tensile tests were made with an Instron tester at some seven crosshead speeds from 0.02 to 20 inches per minute at five or six temperatures from 30° to —46°C. The tests were made on rings cut with a special rotary cutter from the circular sheets of the elastomers. The dimensions of each ring were determined from the weights of the ring and the disc from its center, the thickness of the ring, accurately measured, and the density of the rubber. Typically, the outside and inside diameters were 1.45 and 1.25 inches, respectively, and the thickness was about 0.085 inch. The test procedure used is described elsewhere (11), and the cubic equation, eq 4 in ref. j 2, was used to compute the average strain in a ring from the crosshead displacement. 

Tensile Tests. Polymers were padded on filter paper at lOX add-on, cured at 150°C for 3 or 10 min, and tested as In Tappi Useful Method UH656. Tensile measurements on padded samples were done with 1" strips on an Instron Tester after conditioning In a constant temperature and humidity room. Wet, methyl ethyl ketone (MEK) and perchloroethylene (PCE) tenslles were run after brushing the sample with IX aqueous Aerosol OT or solvent. 

They were then cut with a diamond saw to form 8-mm-long cylindrical plugs and evaluated for diametral tensile strength using an Instron tester. Testing results of selected experimental agents are provided in Table 2. 

To determine the quantitative effects of this consolidation procedure, fabric disks cut from the extracted degraded fabric were used as substrates. These fabrics were torn on an Instron tensile testing machine as described earlier and patched with six applications of either the 0.1% dyed wood pulp or the 0.05% dyed Cellunier P slurry. The samples were then torn again on the Instron tester. The average breaking strengths and add-ons of the samples after six passes with slurry are reported in Table IV. A typical tom fabric and a patched fabric are shown in Figures 6 and 7. 

Samples for adhesion measurements were prepared in a separate chamber with a base pressure of 1 x 10 ° Torr under identical conditions. Typically, -1000 A silver coverages were used for adhesion measurements. Adhesion strength of the deposited Ag films was determined using a polyester adhesive tape and standard peel test procedures on an Instron tester. 

Stress-strain measurements were performed on an Instron Tester, usit ASTM D412 e D dumbbells. The ultimate tensile strength of unfilled vulcanizates were difficult to determine with standard dumbbells because of excessive sHppir. This difficulty was overcome by decreasing the actual load on the dumbbells, by reducing the center width to one fourth of the )ecifications (from 0.125 inches to 0.031 inches). Strain rate was 10 cm/min. 

Elongation and flexural modulus were measured on an Instron tester model number 1125 according to ASTM D-638 and ASTM D-790 tests respectively. 

Adhesive characteristics of thin SPI-100 films could not be measured directly because adhesive forces are generally larger than cohesive forces. To obtain some information on adhesion values, thin high molecular weight SPI-100 films on substrates were overcoated with about. 1 mm of a commercially available polyimide (Product A) to provide greater cohesive strength than can be obtained with SPI-100 alone. The combined layers were then pulled in an Instron tester giving the results shown in Table II which also includes the values for commercial products A and B. 

The determinations where made at 25°C using a Model 1122 Instron tester with a 500 gram load cell. Pull rate was two inches per minute. Apparent tensile strengths averaging 144 to 420 grams per square inch were found with elongations of 85 to 408 percent. 

Modification of the atomic force microscope with feedback loops enabled force-extension curves for individual polysaccharide molecules to be measured under constantly increasing force (rather than constant displacement), in a nanoscale version of the INSTRON tester for measuring paper strength. ... 

Mechanical properties (stress-strain) were measured on an Instron tester at a cross head speed of 10 mm/min. Dumbbells shaped samples were cut with a die and had an 8 mm test length and a thickness of no more than 0.5mm. Additional details may be found in the thesis work of one of the coauthors (C. W. C.) (14). 

For the determination of wet T s, the fibers were allowed to soak In distilled water for 24 hi before testing. Tensile testing was carried out on an Instron tester with the fibers totally Immersed In water at the specified temperature. Testing was carried out at 0, 10, 23, 30, 40, 50, 60, 70, 80, 90,... 

The inflection point in the modulus versus temperature curve can be used to measure T as with an Instron tester. From Figure 15 it is seen that at room temperature and below, PVC is hard and brittle. 

Below Tg (glassyT tensile testing was performed on a model 1131 Instron tester eqxiipped with an environmental chamber. 

Apparatus A latex irradiator with activity 110 kCi Co was u.sed for producing the irradiated natural rubber latex. Automatic dipping condom machine with capacity 45-50 gro.ss/hour was used for producing condom. Apparatus for testing latex and condom were pH meter, Instron tester type 1122, etc. 

Apparatus Latex irradiator with activity 110 kCi Co for producing irradiated latex, automatic dipping machine for examination gloves with capacity 7.0(X) gloves/hour, pH meter, viscometer, Instron tester type 1122 apparatus for measuring the quality of latex and its film were used in this trial... 

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