Qinsun QJ211S Glass Four-Point Bending Strength Tester / Universal Testing Machine
| Brand | Qinsun |
|---|---|
| Model | QJ211S for Glass Applications |
| Type | Electromechanical Universal Testing Machine |
| Maximum Load Capacity | 10 kN |
| Accuracy Class | 0.5 |
| Effective Test Width | 320 mm |
| Stroke (Tensile Space) | 500 mm (optional 800 mm) |
| Test Speed Range | 0.01–300 mm/min |
| Speed Accuracy | ±0.5% of indicated value |
| Force Resolution | 500,000 counts full scale (no internal range switching) |
| Displacement & Strain Measurement Accuracy | ±0.5% of indicated value |
| Load Cell | High-precision U.S.-sourced sensor |
| Controller | Panasonic all-digital AC servo system |
| Control System | Full-closed-loop digital control supporting constant stress, constant strain, and constant displacement modes |
| Safety Protection | Software-based overload diagnosis, electronic travel limits, automatic return post-test, mechanical/electrical interlocks |
| Weight | ~145 kg |
| Compliance | GB, ISO 178, ASTM C1161, JIS R3206, DIN 52303, EN 1288-3, YB/T 5344, JT/T 939 |
Overview
The Qinsun QJ211S Glass Four-Point Bending Strength Tester is a precision-engineered electromechanical universal testing machine specifically optimized for the mechanical characterization of brittle transparent materials—particularly soda-lime silicate glass, chemically strengthened glass (e.g., Gorilla Glass), tempered display substrates, optical lenses, and architectural glazing. It implements standardized four-point bending (4PB) per ISO 178 and ASTM C1161 to determine flexural strength (modulus of rupture), flexural modulus, and load-deflection behavior under controlled quasi-static loading. Unlike three-point bending, 4PB eliminates shear-induced fracture artifacts by generating a uniform moment region between inner supports—critical for evaluating surface flaw sensitivity and intrinsic strength distribution in high-performance glass components used in consumer electronics, automotive HUDs, and building-integrated photovoltaics. The system integrates a rigid dual-column frame, high-resolution force/displacement feedback, and real-time closed-loop control architecture to ensure measurement repeatability ≤0.5% across its 10 kN capacity range.
Key Features
- Four-point bending configuration compliant with ISO 178, ASTM C1161, and EN 1288-3—enabling standardized flexural strength evaluation without edge-effect interference.
- 0.5-class accuracy certified force measurement using traceable U.S.-sourced load cells, with 500,000-count resolution maintained uniformly across full 10 kN range (no auto-ranging or digitization gaps).
- Panasonic all-digital AC servo drive system delivering precise speed control from 0.01 to 300 mm/min (±0.5% accuracy), essential for strain-rate-sensitive fracture initiation studies.
- Full-closed-loop digital control firmware supporting constant stress, constant strain, and constant displacement test profiles—enabling creep, relaxation, and cyclic flexure protocols.
- Dual-speed manual/automatic crosshead adjustment with programmable rapid return, integrated electronic limit switches, and software-driven overload cutoff (>110% F.S.) for operator and specimen safety.
- Modular fixture interface accommodating custom support span configurations (e.g., 20/40 mm for smartphone cover glass; 50/100 mm for architectural laminated panels) and optional tensile, compression, peel, and puncture accessories.
Sample Compatibility & Compliance
The QJ211S accommodates flat, rectangular glass specimens up to 320 mm wide and 500 mm (extendable to 800 mm) in effective travel length. Standardized 4PB fixtures are pre-configured for thicknesses ranging from 0.3 mm (thin display cover glass) to 19 mm (structural laminated glazing). All mechanical and software subsystems conform to GLP-aligned validation requirements: force calibration traceable to NIST-equivalent national standards, displacement verification per ISO 7500-1, and audit-ready event logging—including test start/stop timestamps, parameter changes, and error flags. The system satisfies regulatory documentation needs for ISO/IEC 17025-accredited labs and supports FDA 21 CFR Part 11-compliant electronic records when paired with validated PC software and digital signature modules.
Software & Data Management
Control and analysis are performed via Windows-based Qinsun TestSuite v4.x—a deterministic real-time application built on .NET Framework with deterministic thread scheduling. Raw data acquisition occurs at ≥1 kHz sampling rate, synchronized across force, displacement, and extensometer channels (if installed). The software provides dynamic curve overlay, differential slope calculation for elastic modulus derivation, automatic yield point detection per ASTM E111, and customizable report templates exportable to PDF, Excel, or XML. All test files include embedded metadata: operator ID, calibration certificate IDs, environmental conditions (user-entered), and full audit trail of parameter modifications. Data integrity safeguards include write-once file locking, SHA-256 hash verification, and optional network backup to NAS or LIMS servers.
Applications
- Flexural strength validation of chemically strengthened glass for smartphone and tablet front panels per ASTM D7264 and IEC 62368-1 mechanical safety clauses.
- Quality assurance of tempered automotive side/rear windows per SAE J2334 and ECE R43.
- Development testing of low-E coated insulating glass units (IGUs) under thermal-mechanical coupling simulations.
- Fracture toughness screening of thin-film encapsulated OLED substrates using controlled crack-initiation protocols.
- Interlayer adhesion assessment in laminated safety glass via modified 4PB delamination onset detection.
- Comparative aging studies: humidity-temperature cycling followed by post-exposure flexural retention analysis per ISO 12543-5.
FAQ
What standards does the QJ211S directly support for glass flexural testing?
It natively executes ISO 178, ASTM C1161, EN 1288-3, JIS R3206, and GB/T 9966.2—each with preloaded test method templates, pass/fail logic, and report formatting.
Can the system perform tensile tests on metallic or polymer films?
Yes—when equipped with wedge-action or pneumatic grips and appropriate extensometry, it meets ASTM D638, ISO 527, and ISO 6892-1 requirements for ductile material characterization.
Is remote diagnostics and calibration assistance available?
Qinsun provides secure remote access via TeamViewer with prior authorization, enabling firmware updates, sensor zeroing verification, and real-time technician-guided calibration alignment.
Does the system meet electromagnetic compatibility (EMC) requirements for laboratory environments?
Yes—the mainframe complies with IEC 61326-1 Class A emissions and immunity specifications, validated per EN 61000-6-3 and EN 61000-6-2 for shared lab infrastructure.
How is traceability maintained for force and displacement measurements?
Each unit ships with factory-issued calibration certificates referencing CNAS-accredited reference standards; users may perform intermediate verification using certified deadweight sets and laser interferometer displacement references.
