FLEXURAL STRENGTH OF HAMMOCKS TEST REPORT

Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
FLEXURAL STRENGTH OF HAMMOCKS
TEST REPORT
Version <1.0>
<12/20/2012>
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
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:
Model 1 - 160 kg.
Model 2 - 160 kg.
Model 3 - 160 kg.
Model 4 - 180 kg.
Model 5 - 180 kg.
Model 6 - 240 kg.
Model 7 - 240 kg.
Model 8 - 240 kg.
Model 9 - 180 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;
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
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.
Figure 1 – Flexural Test Assembly
4. TEST RESULTS.
It was performed 9 (nine) tests of hammocks under the service condition of and the results are
shown in the following tables:
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 1 – 160 kg.
Figure 2 - Model 1
Model
Admissible load (Kg)
Failure Load
(Kg)
1
520
800
Comments
 There was no crackling.
 Fabric Break at 800 kg.
Table 1 – Test results for model 1.
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 2 – 160 kg.
Figure 3 – Model 2.
Model
2
Admissible load (Kg)
Failure Load
(Kg)
Comments
 There was no crackling.
 On the side of Rupture
495,78
762,75
occurred abruptly at the
end of the wood support.
Table 2 - Test results for Model 2.
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 3- 160 kg.
Figure 4 - Model 3
Model
Admissible load
(Kg)
Failure Load
(Kg)
3
520
800
Comments
 No snaps.
 No breakage.
Table 3 – Test results for Model 3.
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 4 - 180Kg
Figure 5 - Model 4
Model
Admissible load (Kg)
Failure Load
(Kg)
4
520
800
Comments
 No snaps.
 No breakage.
Table 4 – Test results for Model 4
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 5 – 180Kg.
Figure 6 - Model 5
Model
5
Admissible load (Kg)
412,53
Failure Load
(Kg)
637,75
Comments
 There was no crackling
637.75.
 Break occurred in the
lateral edge of the wood
support.
Table 5 - Test results Model 5
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 6 – 240Kg.
Figure 7 - Model 6
Model
6
Admissible load (Kg)
Failure Load
(Kg)
520
800
Comments
 No snaps.
 Not Broke.
Table 6 - Test results Model 6
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 7 – 240Kg
Figure 8 - Model 7
Model
Admissible load (Kg)
Failure Load (Kg)
7
520
800
Comments
 No snaps.
 No breakage.
Table 7 - Test results for Model 7
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 8 – 240Kg.
Figure 9 - Model 8
Model
Admissible load (Kg)
Failure Load
(Kg)
8
520
800
Comments


No snaps.
No breakage.
Table 8 - Test Results for Model 8
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
Model 9 – 180Kg
Figura 10 - Modelo 9
Model
Admissible load (Kg)
Failure Load
(Kg)
9
520
800
Comments


No snaps
No breakage
Table 9 - Test Results for Model 9
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
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 762.72 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 637.75 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.
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
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.
Model
Admissible load.
Safety factor 35%.
Model 1
Model 2
Model 3
Model 4
Model 5
Model 6
Model 7
Model 8
Model 9
520
495,78
520
520
412,53
520
520
520
520
Table 10.
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075
Laboratory for Fracture Mechanics and Fatigue
Department of Metallurgy and Materials Engineering
FEDERAL UNIVERSITY OF CEARA
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, 2012.
__________________________________
Prof. Dr. Eng. Enio Pontes de Deus.
Director of LAMEFF/UFC.
The results presented in this document have meaning restricted and applies only to the sample(s) tested.
This Test Report cannot be reproduced, except in full, without prior written permission of the Company.
ASTEF – Associação Téc. Científico Engº Paulo Fortim - CNPJ 07.778137/0001-10 - Insc. Municipal 16.130-6
LAMEFF- Laboratório de Mecânica da Fratura e Fadiga – Campus do Pici – Bloco 729 – Fortaleza-CE
CEP: 60.455-760 – Fone: (85) 3366 9075