DE LA SALLE UNIVERSITY - DASMARINAS

College of Engineering, Architecture and Technology

Engineering Department

MEET417L

MATERIAL SCIENCE AND TESTING LABORATORY

TENSILE STRESS TEST SPECIMEN

SUBMITTED BY:

VERNIE HANZEL R. SORIANO, MEE41

SUBMITTED TO:

ENGR. GABRIEL TECSON, RME

DATE SUBMITTED: JULY 24, 2015

I. OBJECTIVES

To be able to determine the maximum tensile stress a specimen can handle. To learn the effect of a tensile load in terms of physical deformity. To determine the strain effect in the specimen after being applied by a tensile force.

2. PROCEDURE OF TEST

Turn on the computer and start the software for the universal testing machine. Place the specimen in the upper portion of the testing machine. This is where

tensile testing is being done. Make sure that the specimen is totally gripped by the machine so that the load can

be applied successfully. Adjust the tensile load through the adjustment knob. See the results.

3. SKETCH OF THE SPECIMEN

4. OBSERVATIONS DURING TEST:

During the test of the specimen, it can be seen that as the load increases, the specimen elongates. The tensile load is applied to the specimen until it fractures. As the stress-strain curve is observed during the test, the curve of the load reaches the ultimate tensile strength. Then the curve starts to decrease until the fracture of the specimen occurs. The specimen is broken into two located at the center of it as shown in the sketch of the specimen.

5. TENSILE STRESS COMPUTATION

6. CONCLUSION

A tensile test is a fundamental mechanical test where a specimen is loaded in a very controlled manner while measuring the applied load and the elongation of the specimen over some distance. It is widely used to measure the properties of the material and to provide information on the strength.

From this experiment, it can be concluded that the material will elongate when tensile load is applied to it. As it elongates, the length of the material increases. Based on the formula of the tensile stress, the tensile stress is directly proportional to the tensile force and indirectly proportional to the area of the material. Therefore, the tensile stress will increase as the tensile force increases.