Hengyi HY-0580 Pneumatic Parallel-Grip Tensile Fixture for Biomedical Materials

Overview

The Hengyi HY-0580 Pneumatic Parallel-Grip Tensile Fixture is a precision-engineered accessory designed exclusively for integration with Hengyi’s electromechanical universal testing machines—specifically the HY-0580 single-arm or dual-arm configurations. It enables controlled, uniform axial loading of delicate and heterogeneous biomedical specimens—including hydrogels, electrospun scaffolds, tissue-engineered constructs, suture materials, vascular grafts, and bioresorbable polymers—under ISO 5832, ASTM F2129, ISO 10993-12, and USP compliant test conditions. The fixture operates on a pneumatic parallel-motion principle: two opposing jaw faces move in strict mechanical synchrony, eliminating angular misalignment and minimizing bending moments during grip engagement and tensile loading. This kinematic design ensures true uniaxial stress application—a critical requirement for valid modulus, yield strength, and elongation-at-break determination in soft biological materials where conventional wedge or screw-action grips induce premature slippage or localized crushing.

Key Features

• Pneumatically actuated parallel jaw motion with adjustable clamping pressure (0.2–0.8 MPa), preventing specimen deformation prior to test initiation
• Interchangeable jaw inserts: smooth stainless steel (for metallic wires), knurled aluminum (for elastomeric films), and low-friction PTFE-coated surfaces (for hydrated hydrogels and collagen matrices)
• Integrated force-synchronized grip activation: jaw closure force scales proportionally with applied tensile load, maintaining constant interface pressure throughout displacement
• Modular mounting interface compatible with Hengyi HY-0580 series crosshead adapters (M12 threaded holes, 60 mm pitch circle diameter)
• Zero-backlash linear guide system ensuring sub-micron positional repeatability between grip cycles
• Compliance with ISO 7500-1:2018 (static calibration of force-measuring systems) and ASTM E4-22 (verification of force-measuring instruments)

Sample Compatibility & Compliance

The HY-0580 fixture accommodates specimens ranging from 0.5 mm diameter sutures to 25 mm wide tissue strips, with thicknesses from 0.05 mm (electrospun nanofibers) to 5 mm (dense bioceramic composites). Jaw face geometry supports ASTM D638 Type I–V dumbbell geometries, ISO 527-2 multipurpose bars, and custom-shaped samples per ISO 13314 (compression testing of cellular metals) and ISO 1798 (flexural testing of flexible cellular materials). All mechanical components meet RoHS Directive 2011/65/EU and are manufactured under ISO 9001:2015 certified processes. Calibration certificates traceable to NIM (National Institute of Metrology, China) and NIST SRM equivalents are available upon request. The system supports GLP-compliant audit trails when paired with Hengyi’s optional 21 CFR Part 11–enabled software module.

Software & Data Management

When operated with Hengyi’s proprietary TestMaster Pro v5.2 control software, the fixture enables automated sequence programming—including pre-load dwell, strain-rate ramping, cyclic loading protocols (e.g., fatigue testing per ISO 14801), and real-time Poisson’s ratio calculation via dual-axis extensometry synchronization. Raw data export formats include .csv, .xlsx, and .tdms (NI-compatible), with metadata embedding test standard ID, operator ID, environmental conditions (optional humidity/temperature sensor input), and digital signature verification. Software validation documentation (IQ/OQ/PQ templates) and electronic logbook functionality support regulated environments in medical device R&D labs and contract testing organizations (CTOs).

Applications

• Tensile characterization of decellularized extracellular matrix (dECM) scaffolds under physiological hydration states
• Adhesion strength testing of bioadhesives (fibrin, cyanoacrylates) on porcine skin or synthetic epidermal models
• Mechanical degradation profiling of PLGA-based drug-eluting stents over accelerated hydrolysis timelines
• Interface shear testing of bone-implant coatings using ASTM F1147 pull-out methodology
• Dynamic viscoelastic mapping of injectable hydrogels via stress-relaxation and creep-recovery protocols
• Standardized suture loop strength evaluation per ISO 7198 and ASTM D3822

FAQ

Is the HY-0580 fixture compatible with non-Hengyi testing systems?
Yes—mechanical mounting adaptors are available for Instron, ZwickRoell, and MTS frames; however, full pneumatic control and synchronized load-grip logic require Hengyi’s proprietary controller interface.
What is the minimum specimen thickness that can be reliably gripped without slippage?
With PTFE-coated jaws and optimized pneumatic pressure (0.3 MPa), specimens as thin as 0.08 mm (e.g., electrospun PCL membranes) maintain ≥95% grip retention across 500 mm/min strain rates.
Does the fixture support high-humidity environmental chambers?
The base aluminum housing is anodized and sealed to IP54; optional stainless-steel upgrade kits are available for continuous operation inside 95% RH chambers at 37°C.
Can deformation be measured directly at the gauge section while using this fixture?
Yes—non-contact video extensometry (Hengyi VE-2000) and clip-on axial extensometers (ASTM E83 Class B-1) mount directly to the fixture’s dedicated brackets without interfering with jaw travel.
Is calibration documentation provided with shipment?
Each unit ships with a factory calibration report (force linearity, parallelism deviation < ±0.02°, jaw face flatness < 1.5 µm) and NIST-traceable load cell certificate for the configured capacity.