Numerical and Experimental Analysis of Wood Tensile Strength Perpendicular to the Grain
João Vítor Felippe Silva, Patrik Luiz Silva de Araujo, Karina Aparecida de Oliveira, Maria Fernanda Felippe Silva, Carolina Aparecida Oliveira, Julio Cesar Molina
Abstract
The Brazilian Code ABNT NBR 7190 (1997) is currently under review process and one of the proposals is the change and add of some test procedures. Several specimen geometric configurations and test conditions have been evaluated by the study committee CE-02:126.10. The aim of this paper was the analysis of the tensile strength perpendicular to the grain through the current Brazilian Code and from an adaptation of ISO 13910 (2005). Pine and Indian Cedar were used and simplified relationships were proposed. Numerical simulations were performed to identify the stress distributions in the specimens. The results obtained by ISO 13910 (2005) did not differ statistically for the two species. Brazilian standard method cedar had a higher strength value than pine. The simplified ratios obtained ranged between 0,017 and 0,123. The numerical simulations of ISO 13910 (2005) specimens showed predominant failure by tension in the lower fiber due to stress concentration.
Keywords
References
-
Almeida JPB, Aquino VBM, Wolenski, ARV, Lahr, FAR, Christoforo AL. Analysis of relations between the moduli of elasticity in compression, tension, and static bending of hardwood. BioResources 2020; 15(2): 3278-3288.
-
Associação Brasileira de Normas Técnicas. NBR-7190: Projeto de Estruturas de Madeira. Rio de Janeiro; 1997.
-
Bidakov AM, Raspopov IA. Test method of CLT by tension perpendicular to grain. Academic Journal. Series: Industrial Machine Building, Civil Engineering 2018; 1(50): 148-158.
-
Costa LJ, Lopes CBS, Reis MFC, Paula MO, Figueiró CG, Fialho LF et al. Effect of Sample Dimensions on Static Bending Test. Floresta e Ambiente 2020; 27(1): e20170996.
-
International Standard. ISO-13910: Structural timber - Characteristic values of strength-graded timber - Sampling, full-size testing and evaluation. Switzerland; 2005.
-
Mascia NT, Kretschmann DE, Ribeiro AB. Evaluation of Tension Perpendicular to Grain Strengths in Small Clear Samples of Sugar Maple for Radial, Tangential and 45-Degree Loading Directions. Materials Research 2020; 23(3): e20190323.
-
Matos GS, Molina JC. Resistência da madeira ao cisalhamento paralelo às fibras segundo as normas ABNT NBR 7190:1997 e ISO 13910:2005. Revista Matéria 2016; 21(4):1069-1079.
-
Molina JC, Calil Junior C, Oliveira DR, Gomes NB. Analytical, experimental and numerical study of timber-concrete composite beams for bridges. Computers and Concrete 2019; 24(2):103-115.
-
Reis AHS, Silva DW, Vilela AP, Mendes RF, Mendes LM. Physical-mechanical Properties of Plywood Produced with Acrocarpus fraxinifolius and Pinus oocarpa. Floresta e Ambiente 2019; 26(4): e20170157.
-
Rocha MFV, Costa LR, Costa LJ, Araújo ACC, Soares BCD, Hein PRG. Wood Knots Influence the Modulus of Elasticity and Resistance to Compression. Floresta e Ambiente 2018; 25(4): e20170906.
-
Schlotzhauer P, Ehrmann A, Bollmus S, Militz H. Critical discussion of perpendicular to grain tension testing of structural timber - case study on the European hardwoods ash, beech and maple. Wood Material Science & Engineering 2019; 15(5):278-288.
-
Tanaami RG. Tração normal Às fibras em peças de madeira [Tese]. São Carlos: Escola de Engenharia de São Carlos, Universidade de São Paulo; 1993.
-
Wu QY, Niu S, Wang HJ, Jin YB, Zhu EC. An investigation of the DOL effect of wood in tension perpendicular to grain. Construction and Building Materials 2020; 256: 119496.
Submitted date:
09/27/2021
Accepted date:
11/25/2021