Reasons for choosing our testing services
ZHONGXI Testing has obtained inspection qualification certifications from multiple countries and regions worldwide. We possess a senior testing team and advanced testing methods, providing independent, impartial, and professional third-party verification services for global carbon projects.
Internationally recognized authority
Certified by multiple international standards such as CNAS, VCS, and GS, with reports universally applicable worldwide.
Global service capability
Covering 140+ countries and regions, it supports on-site detection and remote verification in multiple languages.
Professional experimental methods
Adopt standard experimental methods to ensure accurate and reliable data.
Before sending samples for indicator diagram testing, most engineers inquire whether the laboratory supports their specific material requirements. At our CNAS/CMA-accredited facility, we specialize in evaluating material behavior under stress through indicator diagram measurements, ensuring our services align with the technical needs of clients worldwide. Our capabilities cover a wide range of materials, grades, and applications, supported by rigorous testing methodologies compliant with ASTM, ISO, EN, and GB standards. This service is particularly critical for industries such as automotive, aerospace, construction, and manufacturing, where material performance under dynamic conditions is paramount.
Testing Scope
Our testing scope for indicator diagram measurement and evaluation encompasses a diverse array of materials, including but not limited to metals, alloys, composites, and polymers. We serve materials across various grades, from standard commercial grades to high-performance specialty alloys, catering to applications ranging from structural components to precision mechanical parts. Common application scenarios include fatigue analysis, stress-life evaluation, and material degradation studies, with a focus on determining the elastic and plastic deformation characteristics under cyclic or static loading. Our testing is referenced to international standards such as ASTM E8/E18, ISO 6351, EN 10002, and GB/T 7314, ensuring global compliance and reproducibility.
Testing Items and Parameters
Our indicator diagram testing evaluates multiple key parameters to characterize material behavior. Typical test items include elastic modulus, yield strength, ultimate tensile strength, elongation, and reduction of area. The evaluation focuses on the linear and nonlinear regions of the stress-strain curve, with graded limit requirements based on material type and application specifications. Below is a table summarizing typical parameters and their graded limits for common materials:
| Parameter | Typical Value Range (Steel) | Graded Limit |
|---|---|---|
| elastic modulus (E) | 200-210 GPa | ±2% of measured value |
| yield strength (ReH) | 250-400 MPa | ±3% of measured value |
| Ultimate tensile strength (Rm) | 400-600 MPa | ±4% of measured value |
| Elongation at Break (A) | 5-20% | ±1% of measured value |
Additional parameters, such as strain hardening behavior and residual deformation, may be evaluated based on client requirements. All results are reported with traceable uncertainty statements, ensuring accuracy and reliability for engineering decision-making.
Data and Variation Analysis
In assessing parallel-sample and batch-to-batch variation, our laboratory employs statistical methods to analyze relative deviations between test replicates. For parallel-sample tests, the relative deviation is calculated as the standard deviation divided by the mean value, expressed as a percentage. Typically, parallel-sample relative deviations for mechanical properties are maintained within 2-5% for most materials, adhering to ASTM E692 guidelines. Batch-to-batch variation is evaluated by comparing test results from consecutive production batches or different material lots, with acceptance windows defined based on historical data and client specifications. Our reports include variation analysis charts, such as control charts, to visualize consistency over time. These assessments ensure material consistency and help clients identify potential quality control issues or material variability.
Send us your testing item list and sample details, and our engineers will confirm the applicable items and turnaround within one working day.