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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
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Fatigue01:21

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Updated: Jan 18, 2026

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Assessment of 10CrMo9-10 Power Engineering Steel Degradation State by Using Small Punch Test.

Kamil Majchrowicz1, Barbara Romelczyk-Baishya1, Monika Wieczorek-Czarnocka1

  • 1Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland.

Materials (Basel, Switzerland)
|September 13, 2025
PubMed
Summary

The Small Punch Test (SPT) offers a reliable method for assessing the mechanical properties of degraded power engineering steels. This technique accurately estimates remaining service life by correlating SPT results with tensile strength for 10CrMo9-10 steel.

Keywords:
10CrMo9-10 steeldegradationmechanical propertiessmall punch test

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Structural Integrity

Background:

  • Power engineering steel structures degrade over time, necessitating monitoring of mechanical properties to predict remaining service life.
  • Accurate assessment of material degradation is crucial for ensuring the safety and reliability of critical infrastructure.

Purpose of the Study:

  • To develop and validate a methodology using the Small Punch Test (SPT) for determining changes in mechanical properties of 10CrMo9-10 steel after long-term service.
  • To establish correlations between SPT results and conventional tensile test properties (yield and ultimate tensile strength).

Main Methods:

  • Simulated degradation of 10CrMo9-10 steel through annealing at 770 °C for varying durations.
  • Characterization of mechanical properties using uniaxial tensile tests and the Small Punch Test (SPT) according to EN 10371:2021.
  • Development of a formula correlating SPT parameters (elastic-plastic transition force, maximum force) with yield strength (Rp0.2) and ultimate tensile strength (Rm).

Main Results:

  • Established correlation factors: βRp0.2 = 0.437 and βRm = 0.255.
  • SPT estimations for exploited 10CrMo9-10 steel: Rp0.2 = 236 ± 27 MPa and Rm = 459 ± 17 MPa.
  • SPT results closely matched uniaxial tensile test values (Rp0.2 = 218 ± 3 MPa, Rm = 454 ± 4 MPa).

Conclusions:

  • The Small Punch Test (SPT) is a viable and promising method for evaluating mechanical property changes in structural steels after prolonged service at elevated temperatures.
  • SPT provides a simpler alternative for assessing material degradation and estimating the remaining service life of power engineering components.