ASTM E139 Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metals
ASTM E139 test methods include determining the amount of deformation as a function of time (creep test) and temperature. The value of time is determined by the occurrence of fracture when an adequate force (rupture test) at constant temperature and tensile tension is given to the material.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E139 is a standard test method for evaluating the long-term performance of metallic materials by measuring their response to stress at elevated temperatures. This test is essential for high-performance applications in aerospace and power generation. ASTM E139 outlines steps for creep tests, measuring deformation over time; stress-rupture tests, measuring time to fracture; equipment; data analysis; and determining material properties and reliability under sustained load.
The ASTM E139 test method covers creep and rupture testing of metallic materials. The creep test measures a material’s ability to sustain loads while deforming up to a specified limit. The rupture test measures the load-carrying capability as a function of time. The load-carrying capability of metallic materials can be ascertained by combining these tests. These test methods include measuring the time required for fracture under constant tensile stress (rupture test) and measuring the amount of deformation over time (creep test) for materials subjected to constant tensile stress at a constant temperature.
Scope, Applications, and Benefits
Scope
ASTM E139 defines the standard testing methodologies for assessing the creep, creep-rupture, and stress-rupture characteristics of metallic materials under constant uniaxial load or stress at elevated temperatures for prolonged durations. The standard covers procedures for specimen preparation, loading methods, temperature control, strain measurement, test duration, and data reporting. ASTM E139 is relevant for assessing time-dependent deformation and failure characteristics essential to long-term performance.
Applications
- Evaluation of metals used in power generation equipment (boilers, turbines, heat exchangers).
- Material testing for aerospace and jet engine components.
- Assessment of materials for petrochemical and refinery process equipment.
- Qualification of materials for nuclear reactor components.
- Long-term performance analysis of pressure vessels and piping systems.
Benefits
- Provides reliable data on time-dependent deformation (creep) of metals at elevated temperatures.
- Enables prediction of long-term material performance and durability under sustained loads.
- Helps determine creep-rupture and stress-rupture life for high-temperature components.
- Supports material selection and qualification for elevated-temperature applications.
- Assists in establishing design stress limits and safety factors.
Testing Process
Specimen Preparation
Machine and measure test specimens to specified dimensions; ensure smooth surface finish and proper identification.
1Equipment Setup
Mount the specimen in a calibrated creep-testing machine, ensuring proper alignment, and apply an uniaxial load.
2Test Execution
Maintain a constant load and temperature while recording strain over time
3Data Analysis & Reporting
Determine creep rate, rupture time, and total strain; report test conditions and results per ASTM E139.
4Technical Specifications
| Parameter | Details |
|---|---|
| Test Material | Metallic materials |
| Loading Mode | Constant uniaxial load or stress |
| Specimen Type | Round or flat specimens |
| Specimen Preparation | Machined with smooth surface finish; representative of product form |
| Output Parameters | Creep rate , total creep strain, rupture life |
| Reporting Standard | As per ASTM E139 requirements |
Instrumentation Used
- Creep testing machine or creep frame
- High-temperature furnace or heating chamber
- Load application and dead-weight loading system
- High-temperature extensometer or strain measuring device
- Temperature measurement and control system (thermocouples)
- Data acquisition and monitoring system
Results and Deliverables
- Results obtained from different accepted procedures can vary significantly; therefore, clear identification of the test method used is essential.
- Subsequent studies aimed at establishing critical parameters are often limited by insufficient detail in published reports.
- The long duration of creep and rupture tests makes retesting impractical in many cases.
- Maintaining all controlled variables within recommended limits is challenging during prolonged testing.
- Comprehensive, detailed reporting enables accurate interpretation and use of test results without assuming control levels were not achieved.
Frequently Asked Questions
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