Force capacities typically start around 300kN and can exceed 10,000kN. Prices vary significantly with capacity and sophistication, generally starting in the range of $10,000 to $30,000 for a basic static system and can exceed $20000 for high-capacity systems with dynamic controllers and advanced software. Request a detailed quote based on your specific force, space, and application needs.

Regular maintenance includes monitoring and changing hydraulic fluid and filters, checking for leaks, and verifying system calibration. Compared to electromechanical systems, they require more attention to the hydraulic power unit but are exceptionally robust. Derui provides clear maintenance schedules and offers comprehensive service contracts to ensure optimal performance and uptime.

Yes, this is a key advantage. A modern servo-hydraulic tensile testing machine with a digital controller can be configured for standard static tension/compression tests, low-cycle fatigue tests, and high-frequency dynamic tests. The same machine can be a versatile hub for both routine QC and advanced R&D.

Key industries include:

• Construction & Civil Engineering: For testing rebar, concrete, tendons, and soil/geo-synthetics.

• Aerospace & Defense: For testing large composite structures and landing gear components.

• Heavy Manufacturing: For validating the strength of large forgings, castings, and welded assemblies.

• Automotive: For testing chassis components, axles, and suspension parts, especially for fatigue life.

• Research & Certification Labs: For conducting advanced material research and providing third-party certification for large-scale products.

The key difference is control precision. A standard (or open-loop) hydraulic tester uses manual valves to apply force, offering basic functionality for simple break tests. A servo-hydraulic tensile testing machine employs a closed-loop digital control system. It uses real-time feedback from sensors to a servo valve, allowing for precise control of load, displacement, or strain. This enables not only highly accurate static tests but also complex dynamic waveforms, sine waves, and fatigue cycles, making it essential for modern R&D and certification labs.

Regular maintenance is crucial for reliability and accuracy. Key tasks include:

• Daily/Weekly: Check for hydraulic oil leaks, verify fluid levels, and inspect hose connections.

• Every 6-12 Months: Change hydraulic filters and perform an oil analysis to check for contamination or degradation.

• Annually: Schedule a professional preventive maintenance and calibration service by the manufacturer or an accredited lab. This ensures all sensors, the servo valve, and the controller are performing to specification. Derui offers comprehensive service contracts to manage this proactively.

Absolutely. This is a core strength of a servo-hydraulic system. These machines are exceptionally well-suited for low-cycle fatigue (LCF) testing, where materials are subjected to high-strain, cyclic loads until failure (typically from 1 to 100,000 cycles). The fast response of the servo valve allows for precise control of complex load or strain waveforms, making them ideal for studying the durability of welds, aerospace components, and structural metals under simulated service conditions per standards like ASTM E606.

In construction and civil engineering, hydraulic tensile testing machines are indispensable for quality assurance and compliance:

• Rebar and Pre-stressing Steel: Tensile testing per ASTM A615, A706, and A416 to verify yield strength, tensile strength, and elongation.

• Concrete Compression: Testing cylinders and cores per ASTM C39/C39M using high-capacity compression platens.

• Geosynthetics and Soil Mechanics: Wide-width tensile tests on geotextiles and geogrids (ASTM D4595) and direct shear tests.

• Anchors and Fasteners: Proof testing and determining ultimate load capacity of post-installed anchors and heavy-duty bolts.

Installation is more involved than for a benchtop unit. Key requirements include:

• Substantial Foundation: A thick, reinforced concrete floor (often >12 inches) is mandatory to absorb the massive reaction forces and prevent vibration.

• Adequate Space: Plan for the machine’s footprint plus 3-4 feet of clearance on all sides for operator access, fixture handling, and maintenance.

• Utilities: Requires a 3-phase electrical supply for the hydraulic power unit and potentially process water cooling. The lab must have adequate ventilation and a stable ambient temperature.

• Professional Installation: Always requires factory-trained technicians for assembly, alignment, and commissioning.

Lead times for a custom-configured hydraulic tensile testing machine are typically 16 to 24 weeks. This includes manufacturing of the load frame and power unit, assembly, factory acceptance testing (FAT), and ocean freight. Complex systems with dynamic controllers or large custom fixtures may take longer. It’s crucial to factor in this timeline and any site preparation work (like pouring a foundation) that must be completed before delivery.

Yes, this is a common and powerful combination. High-force servo-hydraulic frames are often paired with environmental chambers for temperature testing (from -70°C to +300°C or higher). This allows for evaluating material properties under extreme conditions—such as testing aerospace alloys at cryogenic temperatures or polymers at elevated temperatures. The integration requires specially designed chamber access ports and often upgraded seals on the hydraulic actuator.

For high-force applications like rebar testing, hydraulic wedge grips are the standard and most reliable choice. Key selection criteria:

• Capacity: Grips must be rated for the machine’s full force. Never use under-rated grips.

• Jaw Face: Use serrated (v-groove) jaws for round rebar and flat knurled jaws for flat specimens.

• Self-Alignment: Look for grips with spherical seating to ensure perfect axial alignment, which is critical for accurate results and preventing premature jaw breakage.

• Safety: Ensure the grip design includes a safety shield to contain fragments in case of specimen failure. For very large diameters, custom split-collar grips may be required.