Mechanical, Structures, Fatigue, and Load Testing - Clark Testing

Mechanical, Structures, Fatigue, and Load Testing



For over 28 years, Clark Testing’s Mechanical, Structures, Fatigue, and Load Testing Laboratory has been active in static load, fatigue load and dynamic load testing services. Located in Buchanan Michigan, Clark’s structural lab features one of the larger load test substructures commercially available throughout the US. Clark’s structural floor measures 90’ X 30’ and in excess of applying loads up to 1.5 million lbs.

The unique features of Clark’s structural lab enables load testing of large components such as aircraft wing/fuselage sections, rail components, off-highway and on-highway vehicle frames. Along with its load-testing floor, Clark’s lab also includes vertical and horizontal load test frames, strong backs and custom designed test fixtures to meet our customer’s load testing needs.

Combining the unique infrastructure with the flexibility of modular hydraulic power supplies, our engineers are able to utilize MTS and National Instruments data acquisition and control systems to develop load profiles simulating field conditions. Load test profiles are often developed in collaboration with our customers determining the required frequency and amplitude derived from field data or predetermined design requirements. All structural load test programs can be custom configured to adapt to temperature variables.

In addition to static load testing and fatigue load testing Clark’s structural testing lab also specializes in Rollover Protective Structure/Falling-Object Protective Structure testing (ROPS/FOPS) along with and Rotary Fatigue and torsional testing services.

Testing Services



  • Structural, Frames, & Beam Fatigue Testing
  • Certification Testing & Standards Including
    • SAE, ASME, ANSI, FMVSS / CMVSS, ISO, and MIL-STD
    • Fatigue, Performance, & Durability Testing
  • Ultimate Strength & Proof Load Testing
  • Tensile & Compression Testing
  • Dynamic & Static Brake Testing
  • ROPS / FOPS / TOPS Testing
  • Servo-hydraulic Actuator and Control System with linear & torsional capability
  • Complete Vehicle or Individual Component Testing
  • Seat, Seat Anchorage & Seat Belt Testing

  • Suspension, Hitches, & 5th Wheel Testing
  • Failure & Fatigue Analysis
  • Field Duty Cycle & Accelerated Lab Fatigue Testing
  • Experimental Stress Analysis
  • Strain Gaging, Stress Coat
  • Custom Testing Programs
  • High Speed Data Acquisition
  • Product Comparison & Benchmark Testing
  • Forensic & Litigation Testing
  • On-Vehicle Performance, Prototype Testing & Efficiency Studies.
  • Long Term Testing Capability


ROPS / FOPS


Clark’s structural laboratory provides ROPS, FOPS & TOPS testing services in accordance with SAE J/ISO 3471 to qualify structures and cabs typically installed on almost any type of operator driven or stationary machinery. These ROPS, FOPS, & TOPS tests insure the protection and safety of operators from a rollover (ROPS), tip over (TOPS) and a falling object (FOPS). Clark Testing has facilities and capabilities to perform destructive testing of large off-road equipment requiring extreme loads up to 1 million pounds.

Learn More about ROPS / FOPS

Rotary Fatigue


Our Rotary Fatigue Laboratory at Clark Testing can conduct beam and torsional fatigue testing of metals at high and low frequency. Our Rotary Fatigue Testing Laboratory can generate high cycle fatigue on components with large diameter and varied lengths including rotations from 30° to 90° rotation. Repeated cyclic loading will cause fatigue and stresses first creating microscopic cracks that propagate to failure at the roots of the cracks to yield during cyclic aging. Shafts, rods, pipe, studs, and threaded connectors are especially prone to this failure mode. Clark’s structural test laboratory recently updated its ISO/IEC accreditation to ISO 17025-2017 certificate number L2163.

Learn More about Rotary Fatigue Testing



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Clark Testing has been providing product qualification testing and design verification for manufactures for over 20 years. We provide our clients with independent testing.

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View Our Accreditations

Clark Testing continuously operates under stringent quality assurance guidelines ensure all policies, practices and procedures meet or exceed industry standards. Clark’s QA/QC programs follow the accreditation guidelines of ISO 17025-2017, 10CFR50 Appendix B, NQA-1 and AIHA.

Quality & Accreditations

Structural Test Equipment

Clark Testing full listing of all available equipment in support of our Structural testing services.

Structural Test Equipment