Vertical Impact Testing Service – Comprehensive Evaluation of Material and Component Resistance to Drop‑Weight and Dynamic Impact Loading
As an ISO/IEC 17025 accredited independent testing laboratory, we offer specialised vertical impact testing services to manufacturers, engineering contractors, and quality assurance teams across the aerospace, automotive, construction, packaging, and protective equipment sectors. Vertical impact – the sudden application of a force perpendicular to the surface of a material or component – is a critical loading condition that simulates real‑world events such as dropped objects, falling debris, tool impacts, and collision loads. Our vertical impact test protocols apply a controlled impact energy to test specimens using drop‑weight, falling‑mass, or pendulum systems, quantifying the energy absorption, penetration resistance, damage tolerance, and failure modes of a wide range of materials and finished products. All methods are aligned with ISO, ASTM, EN, and GB/T standards, including ISO 6603‑2 (Plastics – Determination of puncture impact behaviour), ASTM D7136 (Impact resistance of fibre‑reinforced composites), ASTM D5628 (Impact resistance of rigid plastics), ISO 179 (Charpy impact), ASTM E23 (Notched bar impact), GB/T 14152 (Test method for impact resistance of rigid plastics), and GB/T 14485 (Puncture impact behaviour of plastics). Our inspection and test reports are recognised by the National Medical Products Administration (NMPA), the State Administration for Market Regulation (SAMR), the Ministry of Industry and Information Technology (MIIT), and international certification bodies for product registration, type approval, and quality assurance.
Materials and Products We Regularly Test
Our vertical impact test facilities accommodate a wide range of materials, component geometries, and finished products. Typical test articles include:
- Polymer and composite materials – thermoplastics, thermosets, fibre‑reinforced composites (GFRP, CFRP), and laminated structures
- Metallic materials and alloys – structural steels, aluminium alloys, titanium alloys, and cast irons
- Automotive components – bumper beams, door panels, bonnets, wheel rims, and battery enclosures
- Aerospace components – fuselage panels, wing skins, leading edges, and interior panelling
- Construction materials – concrete, masonry, glass, cladding panels, and roofing systems
- Packaging and protective materials – rigid containers, pallets, crates, and impact‑absorbing foams
- Personal protective equipment (PPE) – safety helmets, guards, and impact‑resistant shields
- Weldments and welded assemblies – including the weld metal, heat‑affected zone (HAZ), and base material
- Surface coatings and paint systems – for assessing adhesion and cracking resistance under impact
Test Methods – Drop‑Weight, Falling‑Mass and Pendulum Impact Systems
- Drop‑weight (falling‑mass) impact test – ISO 6603‑2 / ASTM D5628 / GB/T 14152 – We mount the test specimen (typically a flat plate, disc, or finished component) on a rigid support fixture. A guided falling mass with a specified striker geometry (hemispherical, flat, or ogival) is released from a controlled height, delivering a defined impact energy (in J) to the specimen. The impact energy is calculated from the mass and the drop height: E = m × g × h. The test is performed at room temperature, or at elevated or reduced temperatures using a temperature‑controlled chamber. The striker is instrumented with a load cell to record the force‑time history, and the data acquisition system captures the impact velocity, the peak force, and the energy to peak and total energy.
- Instrumented impact testing – for determining force‑time and energy‑time curves – For advanced characterisation, we use an instrumented drop‑weight impact tester equipped with a piezoelectric load cell (accuracy ±0.5 %). The force‑time curve is recorded and integrated to obtain the energy‑time and velocity‑time curves. The following parameters are determined: (a) peak force – the maximum impact force; (b) energy to peak – the energy absorbed up to the peak force; (c) total energy – the total energy absorbed during the entire impact event; (d) impact velocity – the velocity at impact; (e) displacement – the penetration depth of the striker; and (f) failure mode – ductile, brittle, or mixed.
- Charpy and Izod pendulum impact tests – ASTM E23 / ISO 179 / GB/T 229 – For metallic and polymeric materials, we perform pendulum impact tests on notched and unnotched specimens using a calibrated pendulum impact tester (capacity 0.5‑600 J). The specimen is mounted vertically (Charpy) or as a cantilever (Izod), and the pendulum strikes the specimen at a defined impact velocity (typically 3‑5 m/s). The absorbed energy (in J) is read from the dial or digital display, and the impact strength is calculated (in kJ/m² or J/m).
- High‑velocity impact testing – for ballistic and blast‑resistant materials – For materials intended for ballistic protection, we use a pneumatic launcher or a gas‑gun system to fire a projectile (sphere, fragment‑simulating projectile – FSP, or custom shape) at velocities up to 1 000 m/s. The impact velocity is measured using a high‑speed camera or a velocity screen. The residual velocity and the depth of penetration (or the back‑face deformation) are recorded.
- Low‑velocity repeated impact testing – for assessing fatigue resistance under impact – We apply a series of repeated impacts (typically 10‑1 000 cycles) at a defined energy level, and we monitor the stiffness degradation, the crack growth, and the penetration depth. The test is used to assess the durability of composite structures and protective barriers under repeated impact loading.
- Temperature‑conditioned impact testing – for assessing the effect of temperature on impact behaviour – We condition the test specimen at a specified temperature (e.g., -40 °C, 0 °C, 23 °C, 80 °C) and then perform the impact test within an environmental chamber (or immediately after removal from the chamber). The test assesses the ductile‑to‑brittle transition temperature and the effect of temperature on the impact resistance.
Specimen Preparation and Conditioning – Ensuring Representative Results
- Specimen dimensions – standardised sizes for different test methods – For drop‑weight impact, we prepare flat plates or discs of specified diameter (typically 50‑150 mm) and thickness (3‑10 mm for plastics, up to 25 mm for composites). For Charpy and Izod tests, we prepare standard specimens (10 mm × 10 mm × 55 mm for Charpy, 64 mm × 12.7 mm × thickness for Izod). The specimens are machined to the specified dimensions and surface finish (Ra ≤ 1.6 µm).
- Notch preparation – for impact strength determination – For Charpy and Izod tests, we machine a V‑notch (2 mm deep, 45° included angle, 0.25 mm root radius) using a calibrated notch cutter. For composites and plastics, we may use a U‑notch or a standardised notch geometry as specified by the standard.
- Conditioning – at specified temperature and humidity – ISO 291 / ASTM D618 / GB/T 2918 – The specimens are conditioned at 23 °C and 50 % RH for a minimum of 48 hours before testing. For temperature‑conditioned tests, the specimens are held at the test temperature for a minimum of 2 hours (or until thermal equilibrium is reached).
Data Analysis and Interpretation – Quantifying Impact Performance
- Impact energy (E) – the primary parameter for impact resistance – The impact energy (in J) is the total energy absorbed by the specimen during the impact event. A high impact energy indicates a tough material; a low impact energy indicates a brittle material. For drop‑weight tests, the impact energy is determined from the drop height and the mass.
- Peak force (Fmax) – the maximum force experienced by the specimen – The peak force is the maximum load recorded during the impact. For instrumented tests, the peak force is determined from the force‑time curve. A high peak force indicates a strong, stiff material; a low peak force indicates a soft or compliant material.
- Penetration depth (or displacement at peak force) – a measure of the damage severity – The penetration depth (in mm) is measured from the displacement‑time curve (or by direct measurement after the test). A shallow penetration indicates a high resistance to penetration; a deep penetration indicates a low resistance.
- Failure mode classification – ductile, brittle, or mixed – ASTM D7136 / ISO 6603‑2 – We classify the failure mode of the impacted specimen: (a) ductile – the specimen is permanently deformed but not fractured; (b) brittle – the specimen is cracked or shattered; (c) mixed – a combination of ductile and brittle failure. The failure mode is correlated with the impact energy and the material properties.
- Damage area and extent – for composite and laminated materials – ASTM D7136 – For fibre‑reinforced composites, we measure the damage area (in mm²) using an ultrasonic C‑scan, a thermographic camera, or by visual inspection of the back‑face damage. The damage area is a measure of the impact resistance; a small damage area indicates a high resistance to impact.
- Statistical analysis – for batch‑to‑batch consistency and material qualification – For multiple specimens, we report the mean impact energy, the mean peak force, the mean penetration depth, and the standard deviation. A coefficient of variation (CV) of < 10 % is considered excellent.
Regulatory Compliance and Product Certification – Supporting Industry Standards
Our vertical impact testing services are performed in accordance with the most widely used international and national standards. The most commonly requested include:
- ISO 6603‑2 – Plastics – Determination of puncture impact behaviour of rigid plastics – Part 2: Instrumented impact testing – the international standard for instrumented impact testing of plastics
- ASTM D7136 – Standard Test Method for Measuring the Damage Resistance of a Fibre‑Reinforced Polymer Matrix Composite to a Drop‑Weight Impact Event – for composite materials
- ASTM D5628 – Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimens by Means of a Falling Dart (Tup or Falling Mass) – for falling‑dart impact of plastics
- ISO 179 – Plastics – Determination of Charpy impact properties – for Charpy impact testing of plastics
- ASTM E23 – Standard Test Methods for Notched Bar Impact Testing of Metallic Materials – for Charpy and Izod impact of metals
- GB/T 14152 – Test method for impact resistance of rigid plastics – the Chinese national standard for impact testing of plastics
- GB/T 14485 – Plastics – Determination of puncture impact behaviour of rigid plastics – the Chinese national standard for puncture impact
- GB/T 229 – Metallic materials – Charpy pendulum impact test method – the Chinese national standard for Charpy impact
Report Acceptance and Regulatory Recognition
All vertical impact tests are conducted under our ISO/IEC 17025 accreditation, using calibrated drop‑weight impact testers, pendulum impact testers, and environmental chambers, all traceable to national and international reference standards. Our final test reports include: a complete description of the test article (material, dimensions, manufacturer), the test method and conditions (impact energy, striker geometry, temperature, humidity), the measured parameters (impact energy, peak force, penetration depth, damage area, failure mode), a statistical summary (mean, standard deviation, coefficient of variation), and a clear pass/fail verdict against your specified acceptance criteria. These reports are accepted by the National Medical Products Administration (NMPA), the State Administration for Market Regulation (SAMR), the Ministry of Industry and Information Technology (MIIT), and international certification bodies for product registration, type approval, and quality assurance. Bilingual (English/Chinese) versions are available to facilitate submissions to domestic and international authorities and to support your global market access.
