FLEXURAL STRENGTH OF HAMMOCKS TEST REPORT

Transcription

1 FLEXURAL STRENGTH OF HAMMOCKS TEST REPORT Version <1.0> <12/20/2012>

2 REPORT No. RT13-21 DEPARTMENT OF METALLURGY AND MATERIALS ENGINEERING LABORATORY FOR FRACTURE MECHANICS AND FATIGUE TEST REQUIRED: STRENGTH TEST PRODUCT DESCRIPTION : HAMMOCKS VENDOR: MARAÑON HAMMOCKS BV 1. DESCRIPTION OF SAMPLES Nine (9) hammocks divided into three (3) different models: kg kg kg kg kg kg kg kg kg. 2. VISUAL INSPECTION. Visual inspection was carried out on all hammocks and it was observed the following points: Good appearance; Absence of defects in fabric and stitching; Lack of critical defects in serious in flexible cables;

3 3. FLEXURAL STRENGTH TESTING To analysis of the mechanical behavior of the hammocks, it was used the load assembly as indicated in figure 1. For each flexural test, measurements of loads, hammocks deflections and fabric inspection were made. The load is gradually increased until the specimen breaks. 4. TEST RESULTS. Figure 1 Flexural Test Assembly It was performed 9 (nine) tests of hammocks under the service condition of and the results are shown in the following tables:

4 1 160 kg. Figure 2-1 Admissible load There was no crackling. Fabric Break at 800 kg. Table 1 Test results for model 1.

5 2 160 kg. Figure 3 2. Admissible load There was no crackling ,78 762,75 On the side of Rupture occurred abruptly at the end of the wood support. Table 2 - Test results for 2.

6 3-160 kg. Figure 4-3 Admissible load Table 3 Test results for 3. No snaps. No breakage.

7 4-180Kg Figure 5-4 Admissible load No snaps. No breakage. Table 4 Test results for 4

8 5 180Kg. Figure 6-5 Admissible load 5 412,53 637,75 There was no crackling Break occurred in the lateral edge of the wood support. Table 5 - Test results 5

9 6 240Kg. Figure 7-6 Admissible load Table 6 - Test results 6 No snaps. Not Broke.

10 7 240Kg Figure 8-7 Admissible load Table 7 - Test results for 7 No snaps. No breakage.

11 8 240Kg. Figure 9-8 Admissible load Table 8 - Test Results for 8 No snaps. No breakage.

12 9 180Kg Figura 10 - o 9 Admissible load Table 9 - Test Results for 9 No snaps No breakage

13 5. GENERAL CONCLUSIONS In the visual inspection, no critical or serious flaws were found, and also a good finishing was seen. The standard height of the base of the hammock to the ground was 1 m and the minimum standard height allowed for the trial is 10 cm. In the trial of model 1 The hammock broke at the contact area with the end of the supporting wood and had a resistance of 800 kg. The hammock s elasticity was very high and its base was at the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 2 The hammock broke at the contact area with the end of the supporting wood and had a resistance of kg. The hammock s elasticity was very high and its base was close to the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 3 The hammock did not break and had a resistance of 800 kg. The hammock s elasticity was very high and its base was at the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 4 The hammock did not break and had a resistance of 800 kg. The hammock s elasticity was very high and its base was below the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 5 The hammock broke at the contact area with the end of the supporting wood and had a resistance of kg. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 6 The hammock did not break and had a resistance of 800 kg. The hammock s elasticity was very high and its base was below the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 7 The hammock did not break and had a resistance of 800 kg. The hammock s elasticity was very high and its base was below the limit height (10 cm) to the ground. The end of the support wood left relief marks on the hammock. Its maximum load for a safety coefficient of 35% was 520 kg. In the trial of model 8 The hammock did not break and had a resistance of 800 kg. The hammock s elasticity was very high and its base was below the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg.

14 In the trial of model 9 The hammock did not break and had a resistance of 800 kg. The hammock s elasticity was very high and its base was below the limit height (10 cm) to the ground. Its maximum load for a safety coefficient of 35% was 520 kg. 6. EQUIPMENT USED. Steel reaction frame; Pneumatic actuator; Steel Structure for fixing hammock; 7. GENERAL TABLE. Admissible load. Safety factor 35% , , Table 10.

15 8. TEAM Francisco Antonio Ribeiro Gomes Industrial Mechanical technician LAMEFF / DEMM / UFC Prof. Dr. Eng. - Enio Pontes de Deus Director of LAMEFF LAMEFF / DEMM / UFC. Fortaleza, December 20, Prof. Dr. Eng. Enio Pontes de Deus. Director of LAMEFF/UFC.