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Fatigue and Fracture Toughness Testing

Fatigue testing applies cyclic loading to a test specimen, to understand its performance under similar conditions when in actual use. The load application can either be a repeated application of fixed load or simulation of in-service loads. The load application may be repeated millions of times and up to several hundred times per second.

 

Many engineering metals and alloys display embrittlement at reduced (below sub-zero) temperatures. Structures fabricated from them fracture or shatter unexpectedly at low temperatures when loaded to stress levels at which performance would otherwise be satisfactory at room temperature. To avoid such incidents, selection of the right material can be done by testing them for their mechanical properties.

 

In the recent years, tremendous interest has been generated in fracture toughness testing based on linear elastic fracture mechanics. Fracture mechanics principles have been used to quantify safety factors in structural design, taking into account crack propagation and/or brittle fracture. Most structural members, components, vessels, piping, aviation, and aerospace are designed according to analysis criteria that guard against failure. CTOD testing requirement is most common in welded coupon as recommended in ONGC, EIL, DNV & API specification.

 

TCR Engineering has expanded its capabilities to include fatigue, fracture toughness, CTOD and high-temperature tensile testing with the addition of two fatigue systems with the Universal Testing Machine which has a capacity of 50 kN and 250 kN. The versatile Servo-hydraulic systems will allow the mechanical testing laboratory to perform numerous types of fatigue tests on different specimen sizes and orientations, in the temperature range from ambient to 1000° C. TCR has the capability of applying linear displacements, utilizing linear and hydraulic actuators. Comparison fatigue testing of OEM and alternate source parts can also be performed to demonstrate equivalency of fatigue life.

Fatigue, Fracture Toughness, CTOD, High Temperature Tensile Testing and High/Slow Strain Rate Testing, Mechanical Testing Lab, Aviation, Automotive, crack tip opening, mumbai, india. Fatigue, Fracture Toughness, CTOD, High Temperature Tensile Testing and High/Slow Strain Rate Testing at TCR Engineering Material Testing Laboratory, India, China and Middle East. Fatigue, Fracture Toughness, CTOD, High Temperature Tensile Testing and High/Slow Strain Rate Testing in Mumbai, India.

TECHNICAL CAPABILITIES

TCR Engineering provides a diverse range of capabilities following ASTM/BS/ISO Specifications. Both ASTM E606 (Low-cycle fatigue, strain-controlled Fatigue Testing) and ASTM E466 (Load-controlled Fatigue Testing – High or Low-cycle fatigue testing) has been widely in use at TCR Engineering. Tests are also conducted for TMT RE-BAR, COUPLERS Fatigue test (100 Cycles test & 2 million Cycles test) as per IS 16172-2014. 

Fracture Toughness Testing: Fracture toughness determines the amount of stress required to propagate an existing flaw or defect in specific materials. Since traditional methods of destructive testing cannot always predict how a material will behave during defect fracture, toughness is very important at the design stage

 

Crack-Tip Opening Displacement Testing: Crack-tip opening displacement is used as a type of fracture-toughness testing to determine if a material is appropriate for strenuous working conditions. CTOD testing is the measure of deformation, prior to failure in pre-cracked samples. This type of test is a variation of fatigue testing that has load rates more as representative of in-service conditions. TCR has capability to conduct the CTOD testing at temperature from Ambient to  -25 °C

FATIGUE TEST

  • ASTM E466: Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials

  • ASTM E606: Standard Practice for Strain-Controlled Fatigue Testing

  • ASTM E 2714 – Standard Test Method for Creep-Fatigue Testing

  • ISO 12106: Metallic materials — Fatigue testing —Axial-strain-controlled method

  • ISO 12108-2002 (E) – Metallic materials – Fatigue testing – Fatigue crack growth Method

  • IS16172-2014 Reinforcement Couplers for Mechanical Splices of Bars in Concrete- Specification

FRACTURE TOUGHNESS TEST

  • ASTM E1290: Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement

  • ASTM E1820: Standard Test Method for Measurement of Fracture Toughness

  • ASTM E399: Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials

  • Strain Fracture Toughness (KIC) for Metallic Materials

  • ASTM E1820 Measurement of Fracture Toughness (JIC-CTOD Measurement)

  • ASTM E647: Standard Test Method for Measurement of Fatigue Crack Growth Rates

  • BS 7448 (Part 1 to part 4) Fracture Mechanics Toughness tests. Method for Determination of KLC, Critical CTOD and Critical J Values of Welds in Metallic Materials

  • Fracture Mechanics [K1c, J1c, CTOD] Testing

  • ASTM E1290 Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement

  • IS 16172-2014: Reinforcement Couplers for Mechanical Splices of Bars in Concrete

  • Static Tensile Test (ASTM A1034, IS 16172)

  • Cyclic Tensile Test (ASTM A1034, IS 16172)

  • Slip Test (ASTM A1034, IS 16172) High

  • Cycle Fatigue Test (ASTM A1034, IS 16172)

TCR Engineering undertakes range of testing applications based out of its dedicated Fatigue Test Laboratory  in Mumbai:

  • Fatigue Crack Propagation [da/dN vs ∆K Studies]

  • Fracture Mechanics [K1c, J1c, CTOD] Testing

  • 3 – Point Bend Testing of Materials

  • Spring Fatigue Testing

  • Room Temperature and High Temperature Tests [up to 1000 °C]

  • Tension/Compression

  • Low/High Cycle Fatigue (LCF/HCF) Testing

  • High Temperature Tensile Tests [up to 1000 °C]

  • High Strain Rate Testing [300mm/sec on 50KN and 100mm/sec on 250KN UTM]

  • Slow Strain Rate Testing [10-7 mm/sec on 100kN UTM]

Advantage TCR

1

Superior technology, responsive teams, unbiased reporting and exceptional performance ensure reliable and fast turnaround on all test results

2

A dedicated in-house sample machine shop ensures that all test samples are machined on site

3

Experts in the Machine shop are capable of low-stress grinding and machining sub-size specimens to very close tolerances

4

Highly qualified engineers in the machine shop are capable of undertaking custom-design fixtures, mount specimens for metallographic examinations and custom-fabricate TOFD weld blocks for NDT operators

5

Routine testing of fasteners, chain materials, weld coupons, wire rope, castings, sheet, plate, forgings and other components is done in an effective manner to provide clients an efficient and quality-driven service

6

At TCR, customers feel confident because experienced engineers and technicians not only handle routine but even the most diverse test requests with the same commitment