Experiment 3 - Bend Test of Reinforcing Steel Bars

Mapúa Institute of TechnologySchool of Mechanical and Manufacturing Engineering ME136P – A1 Experiment no. 3 BEND TEST OF REINFORCING STEEL BARS Name: Mañago, Jaya Mae T. Date Performed: 10/26/2015 Student no.: 2012107107 Date Submitted: 11/02/2015 Engr. Jerome Lopena Instructor OBJECTIVES: a. going outward. This is done by placing the specimen on top of the fulcrum rollers. To examine the reinforcing steel bars physical conditions. with the help of the fulcrum rollers. while the flexure bending punch slowly pushes down the midline of the specimen at a certain radius. To determine the ultimate strength of the reinforcing steel bars when subjected to bending load. b. In this experiment. going to the center of the specimen. Bend testing gives a review of the specimen’s modulus of elasticity and its’ flexural or bending strength [2]. we used one plain steel bar and one deformed steel bar for bend testing. stretching the specimen. The specimens under this test have their own neutral axis where the amount of stress or strain is equivalent to zero. Above this neutral axis. we are able to compute for the flexural strength of the steel bars. where the side of the specimen has direct contact with the bending punch has compression forces. After the bend test. We are then able to classify them to their physical conditions. using the maximum force in the printed results. Below the neutral axis. comes the tension force. and some physical information of the specimen. LIST OF APPARATUS:        Shimadzu Universal Testing Machine UH-A-C Series Flexure-bending table apparatus Flexure-bending punch Speed Cutter Steel tapes and Caliper Weighing Scale Marking Device (Center punch or drawn with ink) PROCEDURES: . INTRODUCTION: Bend testing is a method done using the Universal Testing Machine to test one specimen’s ductility [1]. [1]. Figure 3 3. Using the formula: Figure 4 . Prepare one plain steel bar and one deformed steel bar specimen. This will be used for the computation of the actual cross-sectional area of both steel bars.[2]. Determine the length of these specimens. Figure 1 2.[4]. See Fig.[3]. See Fig. Measure the nominal diameter of each specimen.1. Determine the weight of each Figure 2 specimen. Shown in Fig. See Fig. Figure 5 5. See Fig.Cross−sectional Area= 4. . Wait until the flexure bending punch push down the steel bar through the fulcrum rollers. space of π d2 4 Determine the average lugs.[6]. See Fig. and the summation of gaps. for the deformed steel bar specimen.[5]. Perform bend test using the Universal Testing Machine. the average height of lugs. whether it has cracks or none.Figure 6 6. Examine the bent specimen. Classify its physical condition. . Add remarks. and check for cracks along the steel bar. whether the steel bar specimen is good or bad. Each specimen after the bend test is also checked for cracks. to an extent that it passes through the fulcrum rollers. DISCUSSION: In this experiment. See Fig. we are focused on determining the ultimate strength or the flexural strength of the reinforcing steel bars when subjected to bending load. The values for the bending load can be gathered at the printed results of the UTM. 8. and the flexural strength of each steel bar is computed. The maximum force is then printed out. Determine the degree of bend of the steel bar. 9.7. Theses specimens are placed on the fulcrum rollers of the UTM. This is done using one plain steel bar and one deformed steel bar. . Compute for the bending stress or the flexural strength of the steel bar. The flexure bending punch slowly pushes down the midline of the steel bars. Complete the other necessary information in the data sheet. Using the formula: F max x L D x 4 2 Sf = 4 πD 64 10.[7]. Determine the diameter of the flexure bending punch. and the physical condition is recorded on the data sheet. The computed flexural strength of the plain steel bar is also higher than of deformed. they both ended up without cracks along the bent portion.CONCLUSION: The bend testing of both plain steel bar and deformed steel bar provided us with results that the plain steel bar can be subjected into a higher bending load than deformed steel bar. resulting to good remarks. Although. . both specimens differ in the amount of bending load and bending stress they can be subjected to.