Yuelian YL-D23 Dual-Column Electronic Tensile Testing Machine for Jewelry Chains (Compliant with GB/T 35777–2017)
| Brand | Yuelian |
|---|---|
| Origin | Guangdong, China |
| Model | YL-D23 |
| Instrument Type | Electronic Tensile Testing Machine |
| Maximum Test Load | 20 kN |
| Load Measurement Range | 2000 %FS |
| Load Accuracy | ±0.05 %FS |
| Test Stroke | 1000 mm |
| Displacement Resolution | 0.001 mm |
| Load Resolution | 1/500,000 |
| Force Unit Options | N, kgf, lbf, g, ton, MPa |
| Speed Range | 0.01–500 mm/min (PC-controlled) |
| Crosshead Travel Width | 420 mm |
| Power Supply | 220 V, 50/60 Hz, 10 A |
| Motor Drive | Servo Motor + Precision Ball Screw |
| Dimensions (W×D×H) | 880 × 600 × 1600 mm |
| Weight | ~115 kg |
| Standard Accessories | One set of fixtures, PC-based control software, USB interface cable |
Overview
The Yuelian YL-D23 Dual-Column Electronic Tensile Testing Machine is a precision-engineered mechanical testing system designed specifically for the quantitative evaluation of tensile strength, elongation at break, yield behavior, and load–displacement response in fine metallic chains used in jewelry applications. It operates on the principle of controlled uniaxial force application via servo-motor-driven crosshead displacement, coupled with high-fidelity load cell feedback and real-time digital signal acquisition. The system conforms to GB/T 35777–2017 — the People’s Republic of China national standard governing mechanical performance testing of precious metal jewelry chains — and is also validated against internationally recognized metrological and materials testing standards including ISO 7500-1 (static calibration of force-proving instruments), ASTM E4 (load verification of testing machines), EN 10002-1 (tensile testing of metallic materials), and JJG 475–1988 (verification regulation for electronic universal testing machines). Its architecture supports traceable, repeatable, and auditable test execution — essential for quality assurance in jewelry manufacturing, incoming material inspection, and third-party certification laboratories.
Key Features
- Dual-column rigid frame construction with precision-ground ball screw transmission and high-torque servo motor drive, ensuring minimal deflection and long-term mechanical stability under cyclic loading.
- High-resolution load measurement system with ±0.05 %FS accuracy and 1/500,000 internal resolution, enabling reliable detection of subtle force transitions in thin-wire chain specimens (e.g., 0.2–1.2 mm diameter linkages).
- Adjustable crosshead stroke up to 1000 mm and 420 mm test width accommodate extended chain samples, multi-link assemblies, and standardized dog-bone or loop-type fixtures per GB/T 35777–2017 Annex B.
- Full PC-based control interface with programmable speed profiles (0.01–500 mm/min), automatic stop triggers (overload, specimen rupture, upper/lower limit), and hardware-level emergency cutoff.
- Integrated auto-reset function and rapid fixture-height adjustment buttons streamline sequential testing across heterogeneous sample batches.
- Compliance-ready firmware supporting audit trails, user access levels, and electronic signature capture — aligned with GLP and GMP documentation requirements for regulated environments.
Sample Compatibility & Compliance
The YL-D23 is validated for testing metallic jewelry chains fabricated from gold alloys (Au–Cu, Au–Ag), silver alloys (Ag–Cu), platinum group metals (Pt–Ir), stainless steel (316L), and titanium alloys (Ti–6Al–4V). It accommodates both single-link pull tests and full-chain tensile rupture assessments as defined in GB/T 35777–2017 Clause 6. Specimen gripping is achieved using interchangeable pneumatic or wedge-action fixtures with serrated jaws to prevent slippage during high-stress loading. The system meets mechanical verification criteria per ISO 7500-1 Class 0.5 and dimensional repeatability requirements outlined in JJG 475–1988. Calibration certificates are issued traceable to CNAS-accredited national metrology institutes, and all test reports include metadata compliant with ISO/IEC 17025:2017 clause 7.8.2 (reporting of results).
Software & Data Management
The embedded Windows-compatible software platform provides real-time force–displacement curve visualization, multi-curve overlay, and automated calculation of key mechanical parameters: maximum tensile force (Fmax), yield force (Fy), elongation at break (εb), modulus of elasticity (E), and average breaking load per link. Data is stored in native MS Access database format with timestamped entries, operator ID tagging, and version-controlled test method templates. Export options include CSV, PDF, and XML formats suitable for LIMS integration. The software supports 21 CFR Part 11-compliant electronic records when deployed with validated Windows OS configurations and domain-authenticated user accounts. Raw data files retain full 10 kHz sampling fidelity for post-test reanalysis.
Applications
- Verification of chain tensile integrity per GB/T 35777–2017 for domestic and export-oriented jewelry manufacturers.
- Comparative analysis of alloy composition effects on ductility and ultimate strength in R&D labs.
- Incoming inspection of supplier-sourced chains prior to assembly into finished pendants, bracelets, or necklaces.
- Accelerated life-cycle simulation via repeated low-cycle fatigue protocols (optional add-on module).
- Cross-material benchmarking against non-metallic alternatives (e.g., nylon-coated stainless steel, polymer braids) under identical test conditions.
- Support for certification submissions to CNCA, CMA, or international bodies requiring ISO/IEC 17025-accredited test evidence.
FAQ
What standards does the YL-D23 explicitly support for jewelry chain testing?
GB/T 35777–2017 is fully implemented in the default test method library; additional standards such as ISO 7500-1, ASTM E4, and EN 10002-1 are supported via configurable parameter sets.
Can the system perform cyclic or fatigue testing?
Standard configuration supports static monotonic tests only; low-frequency fatigue capability (up to 5 Hz) requires optional dynamic actuator upgrade and dedicated waveform generator module.
Is third-party calibration documentation provided with delivery?
Yes — each unit ships with a factory calibration certificate traceable to NIM (National Institute of Metrology, China), valid for 12 months under normal operating conditions.
What fixture types are included in the standard configuration?
One pair of adjustable wedge-action grips with hardened steel jaws optimized for 0.3–1.5 mm diameter metallic chains; custom fixtures for loop-end clamping or micro-link anchoring are available as accessories.
Does the software meet regulatory requirements for electronic record retention?
When installed on a validated Windows environment with enabled audit logging and role-based access controls, the software satisfies core elements of 21 CFR Part 11 and ISO/IEC 17025:2017 for electronic data integrity.
