Results of an investigation of the service life of heat-resistant materials under repeated static load

1982 ◽  
Vol 14 (9) ◽  
pp. 1173-1178 ◽  
Author(s):  
L. P. Lozitskii ◽  
A. N. Vetrov ◽  
V. A. Ivanenko
Keyword(s):  
Service Life ◽  
Static Load ◽  
Heat Resistant

scholarly journals Recalculation of the basic static load of ball screws

2019 ◽  
Vol 11 (7) ◽  
pp. 168781401986269 ◽  
Author(s):  
Huaxi Zhou ◽  
Changguang Zhou ◽  
Yi Ou ◽  
Zeng-Tao Chen
Keyword(s):  
Service Life ◽  
Correction Factor ◽  
Traditional Method ◽  
Measurement Method ◽  
Static Load ◽  
Accurate Method ◽  
Load Rating ◽  
Iso Standard ◽  
Modified Method ◽  
Ball Number

Based on the correction factor of accuracy applied in ISO standard 3408-4:2006, this article proposed a modified method to calculate the effective ball number and basic static load rating of ball screws. Meanwhile, the basic static load rating of ball screws was obtained through a new measurement method presented in this article. The experimental results, agreeing well with the theoretical values calculated by the modified method, showed that there is a large discrepancy between the basic static load rating calculated by the traditional method and the measured result, which proves that the new modified method is valid. This study provides a more accurate method to obtain the basic static load of ball screws, which is significant for predicting the performance and service life of ball screws.

scholarly journals Cobalt–Niobium-Carbide Eutectic Alloys for Increasing the Service Life of Gas Turbine Engines

2021 ◽  
Vol 22 (4) ◽  
pp. 678-693
Author(s):  
G. P. Dmitrieva ◽  
T. S. Cherepova ◽  
T. V. Pryadko
Keyword(s):  
Service Life ◽  
Gas Turbine ◽  
Niobium Carbide ◽  
Aircraft Engine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Eutectic Alloys ◽  
Heat Resistant ◽  
The Creation

This article represents the stages of the creation of new serial wear-proof and heat-resistant (at temperatures up to 1100 °C) cobalt–Nb-carbide cast eutectic alloys of the KhTN (XTN) grade at the G.V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine, comparing them by their main properties, and use in aircraft engine engineering.

scholarly journals Memory plastics for prosthetic and orthotic applications

1988 ◽  
Vol 12 (3) ◽  
pp. 143-151 ◽  
Author(s):  
A. G. A. Coombes ◽  
C. D. Greenwood
Keyword(s):  
Service Life ◽  
Lower Limb ◽  
Static Load ◽  
Fatigue Testing ◽  
Load Bearing ◽  
Manual Skill ◽  
Static Testing ◽  
Flat Sheet ◽  
Vacuum Forming ◽  
Skill Requirement

Shrink forming prosthetic sockets from memory plastics offers several advantages over existing techniques. The manual skill requirement is reduced relative to drapeforming flat sheet while compared with the Rapidform process, the requirement for a purpose, built vacuum forming machine is eliminated. Two methods for producing thermoplastic sockets from heat snrinkable preforms are described. One uses established heat shrink technology and crosslinked thermoplastics. The second based on blowmoulding simplifies preform manufacture relative to existing techniques by reducing it to a single stage operation. Shrink formed sockets have been produced for three application areas concerned with the lower limb namely load bearing sockets, flexible ISNY type and rigid transparent check sockets. Static testing has demonstrated the ability of shrink formed, load bearing sockets to surpass Philadelphia Static Load Levels (ISPO, 1978) while fatigue testing has indicated a capability for long service life.

Properties of Rolled and Extruded Semiproducts Made of New Al-Cu-Mg-Ag Heat-Resistant B-1213 Alloy

2006 ◽  
Vol 519-521 ◽  
pp. 483-488 ◽  
Author(s):  
I.N. Fridlyander ◽  
V.V. Antipov ◽  
T.P. Fedorenko ◽  
E.G. Jakimova
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Heat Resistance ◽  
Crack Resistance ◽  
Primary Structure ◽  
Elevated Temperatures ◽  
Strength Properties ◽  
Heat Resistant

Main properties and structure of 2 mm thick sheets and 20×100 mm extruded strips made under industrial conditions from Al-Cu-Mg heat-resistant B-1213 alloy with Ag, Cr, Mn and Zr additions were investigated. It was stated that wrought B-1213 alloy semiproducts are superior to analogous semis made of widely used commercial heat resistant AK4-1ch-type alloys (analogues - AU2GN, 2618 alloys) in strength properties and heat resistance characteristics (by 10-20 %) as well as in crack resistance and fatigue life (by 20-40 %). B-1213 alloy is intended for replacement of traditional heat-resistant alloys of system Al-Cu-Mg-Fe-Ni in advanced aircraft primary structure components subjected heating at elevated temperatures (up to 200-250 oC) and allows one to increase weight efficiency, service life and reliability.

scholarly journals RECRYSTALLIZATION IN THE METAL OF WELDING JOINTS OF STEAM TRUCKS

2019 ◽  
pp. 49-52
Author(s):  
V.V. Dmytryk ◽  
A.V. Glushko ◽  
A.K. Tsaryk
Keyword(s):  
Service Life ◽  
Welded Joints ◽  
Structural Heterogeneity ◽  
Recrystallization Process ◽  
Slowing Down ◽  
Heat Resistant ◽  
Long Time ◽  
Welding Joints

The recrystallization process in the structure of welded joints of steam pipelines from heat-resistant pearlitic steels, operated for a long time under creep conditions (Te = 545…585 °С, Рe = 20…25 MPa), reduces their performance. Studying the peculiarities of the recrystallization process will allow slowing down its passage, which is important for increasing the service life of welded joints of steam pipelines, which are characterized by the presence of a certain structural heterogeneity.

Service life of heat resistant alloys with protective coatings in thermocyclic loading

1990 ◽  
Vol 22 (5) ◽  
pp. 664-671
Author(s):  
A. I. Rybnikov ◽  
L. B. Getsov ◽  
I. S. Malashenko
Keyword(s):  
Service Life ◽  
Protective Coatings ◽  
Heat Resistant ◽  
Thermocyclic Loading

Service life of heat-resistant alloys with protective coatings in thermocyclic loading

1996 ◽  
Vol 78 (1-3) ◽  
pp. 103-112 ◽  
Author(s):  
A.I. Rybnikov ◽  
L.B. Getsov ◽  
A.A. Tchizhik ◽  
I.S. Malashenko ◽  
A.S. Osyka
Keyword(s):  
Service Life ◽  
Protective Coatings ◽  
Heat Resistant ◽  
Thermocyclic Loading

Fatigue Life Analysis of the Bolt

2011 ◽  
Vol 121-126 ◽  
pp. 259-262
Author(s):  
Zhong Chao Chen ◽  
Ji Min Zhang
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Shear Force ◽  
Static Load ◽  
Tensile Force ◽  
Fatigue Load ◽  
Safety Coefficient ◽  
Experiment Platform ◽  
Life Analysis ◽  
Fatigue Life Analysis

For the bolts on the experiment table, there are two main kinds of forces, namely, shear force and tensile force. This paper will test these two different forces that the bolts received, verifying their compliance with the service life. Finding out which situation is better by comparing the safety coefficient under the static load and the fatigue life under the fatigue load. And then put forward some reasonable measures for improving to make the bolts meet the fatigue life of the experiment platform.

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