Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D198-22 – Standard Test Method Technical Guide
ASTM D198-22, under the jurisdiction of ASTM Committee D07 on Wood, provides standard test methods for static tests of lumber in structural sizes. Originally approved in 1924, this standard has been continuously updated to include modern wood-based products like structural glued laminated timbers, structural composite lumber, and prefabricated I-joists. It covers the evaluation of flexure, compression, tension, torsion, and shear modulus strength and stiffness through laboratory testing.
📐 Test Methods and Scope
The standard includes test methods for flexure (Sections 4-11), compression for short specimens (13-20), compression for long specimens (21-28), tension (29-36), torsion (37-44), and shear modulus (45-52). These methods are designed for scientific studies, design value development, and quality assurance. The standard references ASTM D9 for terminology and D2395 for density and specific gravity. Provision is made for varying procedures to account for special problems, ensuring adaptability to various wood-based products.
⚙️ Test Procedure and Speed Selection
Each test method has specific procedures to ensure repeatability. Flexure tests evaluate bending strength and stiffness. Compression tests differentiate between short and long specimens, affecting loading rates and support conditions. Tension tests measure tensile strength, while torsion and shear modulus tests assess shear behavior. The standard uses inch-pound units as standard, with SI conversions provided in parentheses. Uniform procedures permit correlation of results from different sources.
📊 Key Measured Properties
Key properties measured include flexural strength, compressive strength for short and long specimens, tensile strength, torsional strength, and shear modulus. These properties are critical for evaluating the mechanical performance of lumber and wood-based products in structural sizes. The test methods provide reliable and repeatable results for research, design, and quality assurance applications.
| 🟦 Test Method | 📏 Sections | 🎯 Key Focus |
|---|---|---|
| Flexure | 4 – 11 | Bending strength and stiffness |
| Compression (Short Specimen) | 13 – 20 | Short member compressive strength |
| Compression (Long Specimen) | 21 – 28 | Long member compressive strength |
| Tension | 29 – 36 | Tensile strength |
| Torsion | 37 – 44 | Torsional strength |
| Shear Modulus | 45 – 52 | Shear stiffness evaluation |
💡 Tip: ASTM D198-22 is ideal for detailed laboratory testing, while ASTM D4761 is designed for field procedures. Use D198 for more accurate and uniform results in scientific studies.
⚠️ Safety: This standard does not address all safety concerns. Users must establish appropriate safety, health, and environmental practices and comply with regulatory limitations.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D198-22?
The standard covers evaluation of lumber and wood-based products in structural sizes by various testing procedures, including flexure, compression, tension, torsion, and shear modulus.
💡 How does ASTM D198-22 differ from D4761?
D198 is intended for laboratory tests with more uniform procedures for accurate results, while D4761 is for field procedures. D198 is used for scientific studies and design value development.
⚡ What units are stated in the standard?
Values are stated in inch-pound units as standard. SI units are provided in parentheses for information only and are not considered standard.
📌 What are the key referenced documents?
Key references include ASTM D9 (Terminology Relating to Wood), D1165 (Nomenclature of Commercial Hardwoods and Softwoods), and D2395 (Test Methods for Density and Specific Gravity).