Application
KASON PIT452CW-60 Automatic Charpy Impact Testing Machine is used for measuring the Charpy impact resistance of metal and other materials
Standards:
ISO 148-1 -Metallic materials - CHARPY pendulum impact test.
JIS Z 2242 -Method for CHARPY pendulum impact test of metallic materials.
EN 10045-1 -Metallic materials-CHARPY impact test.
ASTM E23 (CHARPY) -Standard test method for notched bar impact testing of metallic materials.
GOST 9454-78 -Impact bending test method at low, room and high temperatures.
ISO R83 Impact test of steel (CHARPY) test (U-type notch)
G 145-2007 Pendulum Impact Test Machine
Test Equipment
A typical low temperature impact testing setup includes four core components:
Impact Testing Machine: A rigid frame with a swinging pendulum (weights range from 1J to 500J, depending on material strength). The pendulum is released from a fixed height, strikes the sample, and its post-impact swing height is used to calculate energy absorption.
Temperature-Controlled Chamber/Bath: To cool the sample to the target temperature (e.g., -20°C to -196°C for cryogenic tests). Options include:
Refrigerated air chambers (for moderate low temperatures).
Liquid baths (e.g., liquid nitrogen, ethanol-dry ice mixtures) for precise, ultra-low temperatures.
Standardized Test Samples Broaching Machine: Geometry is defined by standards (e.g., Charpy samples: 55mm × 10mm × 10mm with a 2mm-deep V-notch). Notches are critical-they create a stress concentration, ensuring fracture initiates at a consistent location.
Projector:
5. Test Procedure (General Workflow)
Sample Preparation: Machine the material into standardized notched samples. Ensure surface smoothness and notch precision (e.g., V-notch angle = 45°, root radius = 0.25mm for ASTM A370).
Temperature Conditioning: Place samples in the temperature-controlled chamber/bath and hold them for a specified time (typically 30–60 minutes) to ensure uniform cooling.
Sample Transfer: Quickly move the cooled sample to the testing machine (to minimize temperature rise) and clamp it securely.
Impact & Measurement: Release the pendulum to strike the sample. The machine calculates energy absorption (impact energy, E) as the difference between the pendulum's initial and final potential energy.
Fracture Analysis: Examine the fractured sample:
Ductile fracture: Fibrous, dull surface (energy absorption is high).
Brittle fracture: Flat, shiny surface (energy absorption is low).
Repeat & Data Analysis: Test 3–5 samples at each temperature to account for variability. Plot impact energy vs. temperature to identify the brittle transition temperature (BTT).