Investigating the Underlying Effect of Thermal Modification on Shrinkage Behavior of Bamboo Culm by Experimental and Numerical Methods
Abstract
:1. Introduction
2. Materials and Methods
2.1. Specimen Preparation and Pre-Treatment
2.2. Determination of Heating Range
2.3. Experimental Procedure for Shrinkage Test
2.4. FTIR Analysis
3. Experimental Results
3.1. Effect of Thermal Modification on Physical Changes
3.2. FTIR Analysis
4. Investigation of Thermal Contraction by FEM
4.1. Shrinkage Modeling
4.2. Material Parameters
4.3. Geometrical Modeling and Boundary Conditions
4.4. FE Mesh
5. Numerical Results
5.1. Strain Field Analysis
5.2. Analysis of Effective Strain Distribution
5.3. Analysis of Bamboo Fracture Mechanisms due to Thermal Contraction
5.4. Future Recommendation
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specimen | Temp/°C | Weight Loss/% | Radial Shrinkage/% | Tangential Shrinkage/% | Longitudinal Shrinkage/% | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
24 h | 48 h | 24 h | 48 h | 24 h | 48 h | 24 h | 48 h | ||||||||||
Mn | CV | Mn | CV | Mn | CV | Mn | CV | Mn | CV | Mn | CV | Mn | CV | Mn | CV | ||
With Epidermis | 100 | 3.3 | 0.03 | 3.3 | 0.03 | 0.7 | 0.31 | 1.1 | 0.10 | 1.0 | 0.17 | 1.2 | 0.13 | 0.2 | 0.82 | 0.3 | 0.43 |
150 | 9.9 | 0.04 | 15 | 0.03 | 1.3 | 0.12 | 2.7 | 0.20 | 1.7 | 0.13 | 2.8 | 0.04 | 0.1 | 0.50 | 0.9 | 0.07 | |
200 | 41 | 0.03 | 50 | 0.03 | 17 | 0.03 | 23 | 0.01 | 18 | 0.08 | 23 | 0.12 | 0.6 | 0.52 | 1.1 | 0.10 | |
Without Epidermis | 100 | 3.4 | 0.01 | 3.4 | 0.01 | 0.6 | 0.35 | 0.7 | 0.30 | 0.9 | 0.14 | 1.1 | 0.16 | 0.3 | 0.65 | 0.4 | 0.74 |
150 | 10.0 | 0.03 | 16 | 0.02 | 1.2 | 0.81 | 1.6 | 0.52 | 0.9 | 0.49 | 2.1 | 0.12 | 0.2 | 0.22 | 0.7 | 0.20 | |
200 | 41 | 0.03 | 51 | 0.02 | 18 | 0.18 | 24 | 0.06 | 18 | 0.09 | 25 | 0.06 | 0.1 | 0.91 | 1.1 | 0.10 |
Peak | Assignment | Frequency (cm−1) | References |
---|---|---|---|
1 | C-C deformation | 423 | |
2 | C-H deformation in cellulose | 605 | [40] |
3 | C-H deformation of glucose ring in cellulose and hemicellulose | 897 | [40] |
4 | C-O, C-H primary alcohol, guaiacyl (lignin) | 1039 | [40] |
5 | C-O-C Carbohydrate from hemicellulose | 1160 | [40,41] |
6 | Guaiacyl ring breathing with CO-stretching (lignin and hemicelluloses), esters | 1242 | [40,41,42] |
7 | C=O free carbonyl groups, Stretching of acetyl or carboxylic acid (hemicelluloses) | 1730 | [40,41,42,43,44,45] |
8 | Adsorbed CO2 | 2317, 2351, 2372 | [46] |
9 | C-H in Cellulose and hemicellulose stretching | 2945 | [41,45,47] |
10 | O-H stretching in Alcohols, phenols, acids, and weakly bounded absorbed water from lignin. | 3400 | [41,45,47] |
11 | O-H stretching of adsorbed water and intermolecular bonded OH. | 3566, 3597, 3618 | [46] |
Thermal Expansion Parameters | ||||||
---|---|---|---|---|---|---|
Parameter | Internode | Node | ||||
Radial | Tangential | Longitudinal | Radial | Tangential | Longitudinal | |
Change in Length ΔL (%) | 2.17 | 1.67 | 0.17 | 1.73 | 1.33 | 0.13 |
Coefficient of Thermal Expansion α (K⁻¹) | −1.08 × 10−4 | −8.33 × 10−5 | −8.33 × 10−6 | −8.67 × 10−5 | −6.67 × 10−5 | −6.67 × 10−6 |
Orthotropic Material Parameters | |||||||||
---|---|---|---|---|---|---|---|---|---|
Internode | Node | ||||||||
Elastic Modulus (MPa) | Poisson’s Ratio | Shear Modulus (MPa) | Elastic Modulus (MPa) | Poisson’s Ratio | Shear Modulus (MPa) | ||||
EL | ET | νL | νT | GL | EL | ET | νL | νT | GL |
15,000 | 675 | 0.3 | 0.0135 | 630 | 30,000 | 1350 | 0.3 | 0.0135 | 1260 |
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Ramful, R.; Sunthar, T.P.M.; Zhu, W.; Pezzotti, G. Investigating the Underlying Effect of Thermal Modification on Shrinkage Behavior of Bamboo Culm by Experimental and Numerical Methods. Materials 2021, 14, 974. https://doi.org/10.3390/ma14040974
Ramful R, Sunthar TPM, Zhu W, Pezzotti G. Investigating the Underlying Effect of Thermal Modification on Shrinkage Behavior of Bamboo Culm by Experimental and Numerical Methods. Materials. 2021; 14(4):974. https://doi.org/10.3390/ma14040974
Chicago/Turabian StyleRamful, Raviduth, Thefye P. M. Sunthar, Wenliang Zhu, and Giuseppe Pezzotti. 2021. "Investigating the Underlying Effect of Thermal Modification on Shrinkage Behavior of Bamboo Culm by Experimental and Numerical Methods" Materials 14, no. 4: 974. https://doi.org/10.3390/ma14040974