Pemeriksaan Kuat Tekan Kayu

Summary

This video demonstrates an experiment to test the compressive strength of kamper wood. The process involves measuring the wood’s dimensions using a caliper, followed by applying pressure in a compression testing machine until the wood fails. The maximum load the wood can withstand is recorded, and its compressive strength is calculated. The results reveal that kamper wood has a compressive strength of 56.11 MPa, placing it in Class 2 for strength classification. The experiment highlights the importance of accurately measuring material properties for use in construction and manufacturing.

Takeaways

• 😀 The experiment aims to determine the compressive strength of a camphor wood beam.
• 😀 Equipment used includes a caliper for dimension measurement, a stopwatch for timing, and a compression testing machine for applying force.
• 😀 The wooden beam's dimensions (length, width, height) are measured three times for accuracy.
• 😀 The length, width, and height of the wood beam are recorded as 199 mm, 39 mm, and 53.85 mm, respectively.
• 😀 The compressive strength test involves applying pressure to the wood until it cracks, recording the maximum force it can withstand.
• 😀 The maximum load recorded during the test was 161 kN before the wood began to crack.
• 😀 The compressive strength is calculated using the formula: Stress = Force / Area, resulting in approximately 76.67 MPa.
• 😀 The calculated compressive strength places the camphor wood in Class 2 for compressive strength, based on a classification table.
• 😀 The procedure involves ensuring all equipment is calibrated to zero before beginning the test and taking note of the time it takes for the beam to fail.
• 😀 The experiment concludes with the classification of the camphor wood's strength and its suitability for moderate structural applications.

Q & A

What is the primary purpose of the experiment described in the script?

The primary purpose of the experiment is to measure the compressive strength of a wood specimen, specifically a *kamper* wood beam, by applying pressure until it cracks or fails.

What tools are used to perform the measurements in this experiment?

The tools used in the experiment include a caliper (or vernier caliper) to measure the dimensions of the wood, a stopwatch to measure the time during the loading process, and a machine to apply compressive force to the wood specimen.

Why is the caliper used multiple times to measure the dimensions of the wood specimen?

The caliper is used three times on each side of the wood specimen to ensure accuracy. The measurements are taken at different positions to account for any variations in the dimensions, and the average is then calculated to increase precision.

What is the role of the compressive strength testing machine?

The compressive strength testing machine applies increasing pressure to the wood specimen until it cracks or fails. It is also used to measure the maximum force the wood can withstand before breaking, and records this value along with the time it took to reach maximum load.

How is the maximum load measured during the compressive strength test?

The maximum load is measured by monitoring the force displayed on the machine's screen as the pressure is applied to the wood. The test is stopped when the wood cracks, and the maximum value recorded at that moment is noted.

What happens to the wood specimen during the compressive strength test?

During the test, the wood specimen experiences increasing pressure, and cracks or damage (such as splitting) appears, particularly at the ends. These cracks indicate the failure point of the wood under compressive stress.

What is the significance of measuring the time during the compressive loading?

Measuring the time during the loading process helps to analyze the rate at which the wood withstands the applied pressure and provides insight into the material's behavior under stress.

How are the dimensions of the wood specimen recorded in the report?

The dimensions of the wood specimen (length, width, and height) are measured multiple times and then averaged. These values are recorded in the report, which includes the dimensions for each side of the wood specimen.

What does the report conclude about the compressive strength of the wood?

The report concludes that the compressive strength of the *kamper* wood specimen is 56.71 MPa, based on the maximum load the wood can bear before cracking. This value is compared against standard classification tables to determine the wood's strength class.

How is the compressive strength calculated from the maximum load?

The compressive strength is calculated using the formula: compressive strength = force / area. The force is taken from the maximum load recorded during the test, and the area is calculated using the dimensions of the wood's cross-section.