Effect of elevated temperatures on the residual mechanical properties of high-performance mortar

Abstract Berylco 25S alloy is the high-performance beryllium-copper spring material of 2 percent nominal beryllium content. It responds to precipitation-hardening for maximum mechanical properties. It has high elastic and endurance strength, good electrical and thermal conductivity, excellent resistance to wear and corrosion, high corrosion-fatigue strength, good resistance to moderately elevated temperatures, and no embrittlement or loss of normal ductility at subzero temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-3. Producer or source: Beryllium Corporation.

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Experimental investigation and probabilistic models for residual mechanical properties of GFRP pultruded profiles exposed to elevated temperatures

Composite Structures ◽

10.1016/j.compstruct.2018.12.032 ◽

2019 ◽

Vol 211 ◽

pp. 610-629 ◽

Cited By ~ 13

Author(s):

Esmaeil Pournamazian Najafabadi ◽

Mohammad Houshmand Khaneghahi ◽

Hossein Ahmadie Amiri ◽

Homayoon Esmaeilpour Estekanchi ◽

Togay Ozbakkaloglu

Keyword(s):

Mechanical Properties ◽

Experimental Investigation ◽

Probabilistic Models ◽

Elevated Temperatures ◽

Residual Mechanical Properties

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Effect of cooling on the residual mechanical properties and cracking of plain and fibrous geopolymer concretes at elevated temperatures

Structural Concrete ◽

10.1002/suco.201800267 ◽

2019 ◽

Vol 20 (5) ◽

pp. 1583-1595 ◽

Cited By ~ 1

Author(s):

Faiz U. A. Shaikh

Keyword(s):

Mechanical Properties ◽

Elevated Temperatures ◽

Residual Mechanical Properties

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Additive Manufacturing of Nickel-Based Superalloys

Volume 1: Additive Manufacturing; Bio and Sustainable Manufacturing ◽

10.1115/msec2018-6666 ◽

2018 ◽

Cited By ~ 3

Author(s):

Benjamin Graybill ◽

Ming Li ◽

David Malawey ◽

Chao Ma ◽

Juan-Manuel Alvarado-Orozco ◽

...

Keyword(s):

Mechanical Properties ◽

Additive Manufacturing ◽

Process Parameters ◽

High Performance ◽

Structural Integrity ◽

Elevated Temperatures ◽

Secondary Phases ◽

Treatment Regimens ◽

Operating Environments ◽

Manufacturing Technologies

Additive manufacturing enables the design of components with intricate geometries that can be manufactured with lead times much shorter when compared with conventional manufacturing. The ability to manufacture components out of high-performance metals through additive manufacturing technologies attracts industries that wish to develop more complex parts, but require components to maintain their structural integrity in demanding operating environments. Nickel-based superalloys are of particular interest due to their excellent mechanical, creep, wear, and oxidation properties at both ambient and elevated temperatures. However, relationship between process parameters and the resulting microstructure is still not well understood. The control of the microstructure, in particular the precipitation of secondary phases, is of critical importance to the performance of nickel-based superalloys. This paper reviews the additive manufacturing methods used to process nickel-based superalloys, the influence of the process parameters on microstructure and mechanical properties, the effectiveness of various heat treatment regimens, and the addition of particles in order to further improve mechanical properties.

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IM7/LARC™-IAX-3 Polyimide Composites

High Performance Polymers ◽

10.1088/0954-0083/10/2/004 ◽

1998 ◽

Vol 10 (2) ◽

pp. 193-206 ◽

Cited By ~ 9

Author(s):

T H Hou ◽

T L St Clair

Keyword(s):

Mechanical Properties ◽

High Performance ◽

Elevated Temperatures ◽

Flexural Modulus ◽

Longitudinal Tensile Strength ◽

Molecular Weights ◽

Short Beam ◽

Beam Shear ◽

Carrier Solvent ◽

Langley Research Center

LARC™-IAX-3 (Langley Research Center™-improved adhesive experimental resin-3) aromatic polyimide, based on oxydiphthalic anhydride, 3,′4-oxydianiline (3,′4-ODA) and 1,4-phenylenediamine ( p-PDA), was evaluated as a matrix for high-performance composites. Four poly(amide acid) solutions in either N-methypyrrolidone or γ-butyrolactone, end-capped with phthalic anhydride to various theoretical molecular weights, were synthesized. Unidirectional prepreg was fabricated from each of the four resins utilizing NASA-Langley’s multipurpose prepreg machine. The temperature-dependent volatile depletion rates, the thermal crystallization behaviour and the resin rheology were characterized. Based on this information, a composite moulding cycle was developed which consistently yielded well consolidated void-free laminate parts. Composite mechanical properties such as short beam shear strength, longitudinal and transverse flexural strength and flexural modulus, longitudinal tensile strength and notched and unnotched compression strengths were measured at room temperature (RT) and elevated temperatures. Similar properties were obtained independent of the carrier solvent used during matrix resin synthesis. These mechanical properties were superior to those previously measured for IM7/LARC™-IA and IM7/LARC™-IAX composites. The enhanced mechanical properties were attributed to the substitution of 25% 3,′4-ODA by p-PDA in the LARC™-IA imide backbones.

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Behavior of Steel Slag Concrete Subjected to Elevated Temperature

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.d7226.049420 ◽

2020 ◽

Vol 9 (4) ◽

pp. 1165-1170

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compressive Strength ◽

High Temperatures ◽

Elevated Temperatures ◽

Coarse Aggregate ◽

Steel Slag ◽

Partial Replacement ◽

High Porosity ◽

Residual Mechanical Properties

Recycling of materials has become a major interest for engineers. At present, the amount of slag deposited in storage yard adds up to millions of tons/year leading to the occupation of farm land and serious pollution to the environment, as a result of the rapid growth in the steel industry. Steel slag is made at 1500- 1650°C having a honey comp shape with high porosity. Using steel slag as the natural aggregate with a lower waste material cost can be considered as a good alternative for sustainable constructions. The objective of this study is to evaluate the performance of residual mechanical properties of concrete with steel slag as coarse aggregate partial replacement after exposing to high temperatures .This study investigates the behavior of using granulated slag as partial or fully coarse aggregate replacement with different percentages of 0%, 15%, 30%, 50% and 100% in concrete when subjected to elevated temperatures. Six groups of concrete mixes were prepared using various replacement percentages of slag exposed to different temperatures of 400 °C, 600 °C and 800 °C for different durations of 1hr, 1.5hr and 2hr. Evaluation tests were compressive strength, tensile strength, and bond strength. The steel slag concrete mixes showed week workability lower than control mix. A systematic increasing of almost up to 21.7% in compressive strength, and 66.2% in tensile strength with increasing the percentage of steel slag replacement to 50%. And the results showed improvement on concrete residual mechanical properties after subjected to elevated temperatures with the increase of steel slag content. The findings of this study give an overview of the effect of steel slag coarse aggregate replacement on concrete after exposed to high temperatures.

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