Information on the most widely used ASTM standards within the materials testing industry
Falling weight impact test
Pipe Falling Hammer impact testing machine is a specialized device used to determine the resistance of plastic pipes, sheets, and products to external impact. lt is suitable for testing materials such as PVC-U water supply pipes, sewage pipes, low-pressure water supply pipes, low-pressure water delivery pipes, core-layer foam pipes, double-walled corrugated pipes, PE pipes, PP pipes, and rigid plastic sheets. This equipment meets the standard of ISO 3127, ASTM D2444, DIN-EN 744, BS-EN 1411 for quality inspection and scientific research and analysis in fields such as building materials, chemicals, and petroleum. The testing machine employs an electromagnetic braking design to prevent secondary impacts and is equipped with automatic lifting, height numeric display, and a V-shaped sample clamping device.
Our Most Popular Falling hammer impact testing machine
Conduit pipe Drop (Free Falling) Weight Impact Tester
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Falling Hammer Impact Tester/ Drop weight impact test
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Drop Dart (Free-falling Dart) Impact Tester
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Paint Coating Tubular Impact Tester ASTM D2794
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Electrical conduit impact test equipment EN 61386-1
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What is Falling weight impact testing machine?
A Falling Weight Impact Testing Machine (FWITM), also known as drop weight impact tester or drop tower impact machine, is a specialized instrument for evaluating material/ component resistance to sudden, high-speed impact loading by dropping a defined weight from a controlled height onto a specimen. It simulates real-world impact scenarios (e.g., drops, collisions) to assess failure modes (cracking, deformation, penetration) and energy absorption capacity.
The fundamental equation governing impact energy is: E = mgh (Energy = mass × gravity × height)
| Test Type | Description | Typical Applications |
|---|---|---|
| Free-Fall Impact | Weight strikes unsupported/ simply supported specimen | Plastics, composites, thin sheets |
| Puncture Impact | Hemispherical/ conical tup penetrates clamped specimen | Films, packaging, laminates (ASTM D3763, ISO 6603-2) |
| Gardner Impact | Hemispherical punch driven by falling weight | Coatings, thin plastics (ASTM D5420) |
| Drop Weight Tear Test (DWTT) | Heavy weight impacts notched steel plate | Pipeline steels, pressure vessels (ASTM E436, API RP 5L3) |
| Component Level | Full-scale product impact simulation | Automotive parts, electronic enclosures, medical devices |
Critical Test Parameters
To ensure reliable results, control these variables:
Impact Energy (mgh): Primary test variable, set by weight mass and drop height
Impact Velocity: Determined by drop height (v = √(2gh))
Striker Geometry: Hemispherical, conical, or custom (per standard)
Specimen Support: Clamped, simply supported, or free-standing (depends on test type)
Environmental Conditions: Temperature (-70°C to 150°C), humidity, pre-conditioning
Data Sampling Rate: Minimum 100 kHz for capturing dynamic fracture events
Applications Across Industries
FWITM is critical for safety and performance validation in:
Materials Science – Characterize ductile-to-brittle transition (especially for steels) and impact toughness
Automotive/Aerospace – Test bumpers, battery housings, interior components, and composite structures
Pipelines & Pressure Vessels – Evaluate fracture resistance of high-strength steels (X80/X100) under extreme conditions
Packaging & Logistics – Verify product protection during shipping (drop testing)
Construction Materials – Assess impact resistance of concrete, insulation (EPS/XPS), and glass panels
Medical Devices – Test implantable components and surgical instruments for impact durability
Consumer Electronics – Validate product robustness against accidental drops
FWITM vs. Pendulum Impact Testing (Charpy/Izod)
| Parameter | Falling Weight Impact Testing | Charpy/Izod Pendulum Testing |
|---|---|---|
| Energy Range | Wide (1 J to 100 kJ+); scalable for large components | Limited (up to ~5 kJ); optimized for small specimens |
| Specimen Size | Accommodates full-scale components and large plates | Requires standardized small specimens (10×10×55 mm typical) |
| Impact Velocity | Higher (2–10 m/s+); better simulates real-world crashes | Lower (1–5 m/s); standardized for material comparison |
| Data Output | Force-displacement curves, peak load, energy absorption | Total energy absorbed; limited dynamic response data |
| Failure Analysis | Better for studying progressive damage and large deformations | Focuses on brittle fracture initiation and transition temperatures |
| Cost & Complexity | Higher initial cost; more complex setup | Lower cost; simpler operation and maintenance |
| Best For | Product-level validation, large structures, high-energy impacts | Material screening, quality control, basic research |
Corresponding standards
ISO 3127 Thermoplastics pipes -- Determination of resistance to external blows -- Round-the-clock method
ISO 3127 specifies a method for the determination of the resistance to external blows of thermoplastics pipes of circular cross-section; it is called the round-the-clock method.
It is applicable to isolated batches of pipe tested at 0 °C (information is also given for sampling from the continuous production of pipe).
Test pieces are subjected to blows from a falling striker, of specified mass and shape, dropped from a known height onto specified positions around the circumference of the test piece. The true impact rate of the batch, or production run from an extruder, is estimated.
Commonly the impact height 2000mm, impact hammer 6.3kg, 9.1kg, 13.6kg.
ASTM D2444 test method covers the determination of the impact resistance of thermoplastic pipe and fittings under specified conditions of impact by means of a tup (falling weight). This method is applicable to isolated batches of pipe tested at 0 °C (information is also given for sampling from the continuous production of pipe).
EN 744 specifying the round-the-clock falling-weight impact method to evaluate the resistance to external blows of circular cross-section thermoplastics pipes. It's a standardized procedure to determine the ability of thermoplastic pipes to withstand external impacts without failing.
ISO 7765-1:1988 Plastics film and sheeting — Determination of impact resistance by the free-falling dart method
Part 1: Staircase methods
ISO 7765-1 and ASTM D1709 specifies methods for the determination of the energy, that causes plastics films and sheet less than 1 mm in thickness to fail under specified conditions of impact of a free falling dart from a specified height, that would result in failure of 50 % of the specimens tested. Two methods are described. Method A employs a dart with 38 mm diameter hemispherical head, dropped from a height of 0,66 m, and method B employs a dart with a 50 mm diameter hemispherical head dropped from a height of 1,50 m. The measurement technique is the staircase method.
Drop Dart Impact Resistance of Plastic Film ASTM D1709, ISO 7765
ASTMD3029 is designed to determine the relative ranking of rigid plastic materials based on the energy required to crack or break them under specified impact conditions.
ASTMD5420 measures the relative ranking of materials based on the energy required to crack or break a plastic sheet when struck by a falling weight (the "Gardner Impact" method).
ASTMD5628 specifies a falling‑dart/tup method to measure the threshold impact‑failure energy for flat rigid plastics. It uses the Bruceton Staircase (Up‑and‑Down) Method to determine the energy causing 50% of specimens to fail (mean‑failure energy, MFE).
EN 1411 specifies a standardized laboratory procedure to evaluate the impact toughness of thermoplastic pipes. Unlike pass/fail tests, this method statistically determines the H₅₀ value—the estimated height of fall that causes a 50% failure rate in a batch of pipes.
ISO 6603-1 specifies falling-dart methods to measure the puncture‑impact performance of rigid plastics using only the 50% impact‑failure energy (E₅₀) threshold, without recording force–time or force–deflection curves.
ISO 11173 specifies the staircase falling-weight impact method to evaluate the external impact resistance of circular thermoplastic pipes, mainly for batch qualification at 0 °C (–20 °C recommended for sub-zero testing).
ASTM D1709: Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method
ASTM D1709 test methods cover the determination of the energy that causes plastic film to fail under specified conditions of impact of a free-falling dart. This energy is expressed in terms of the weight (mass) of the missile falling from a specified height which would result in 50 % failure of specimens tested.
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