Low‐cycle fatigue behaviour of ductile closed‐cell aluminium alloy foams

Abstract

This work investigates the fatigue response of a class of ductile closed‐cell aluminium alloy foams, known by their commercial name Alulight M8. In order to determine the yield stress of the used foams, preliminary experimental tests were performed, at room temperature, in monotonic compression on cylindrical specimens of 25 mm diameter and 25 mm height, with a loading speed of 10 mm/min. Fatigue tests were performed in uniaxial compression on cylindrical specimens (25 mm × 25 mm) with a stress ratio of R = 0.1, at a frequency of 10 Hz. The peak stress was varied from 110 to 135% of the yield stress in compression. Tested specimens were cut from the same cylindrical bar, and the density of the investigated material was 500 kg/m3 ± 10%, or a total of 18 specimens being investigated. With the gathered experimental data, S–N curve was generated, and the effect of cellular structure (e.g. structure irregularity–the number and the size of cells) being investigated and discussed.

Fabrication and Fatigue Behavior of Aluminum Foam Sandwich Panel via Liquid Diffusion Welding Method

“…For Equation (3) [37], b is the AFS width, t is the thickness of face sheet, l is the span length of three-point bending, S is the length between to upper forces in four-point bending fatigue failure, σ f is the yield strength of face sheet, σ c is the yield strength of core.…”

“…According to Equations (1) and (2) above, the fatigue limit of metallurgical joining samples is 3058 N, adhesive joining samples is 2829 N (see Table 2). Besides, since it is the estimating limits, for further research more factors should be considered such as the strain degradation of pure foams [37]. Figure 7 shows the S-N curves of the two kinds of sandwich panels.…”

“…According to Equations (1) and (2) above, the fatigue limit of metallurgical joining samples is 3058 N, adhesive joining samples is 2829 N (see Table 2). Besides, since it is the estimating limits, for further research more factors should be considered such as the strain degradation of pure foams [37]. Average 1 metallurgical 5300 1438 1238 2 metallurgical 5300 1092 3 metallurgical 5300 1184 4 metallurgical 4900 8890 9639 5 metallurgical 4900 10,435 6 metallurgical 4900 9592 The deflection curves of the two kinds of samples for various stress levels are shown in Figure 8.…”

Compression‐compression fatigue performance of aluminium matrix composite foams reinforced by carbon nanotubes

“…Most of the previous reports consider cycle number of 10 6 as the end condition of compression-compression fatigue tests for metal foams. [37][38][39] The maximum stress when the fatigue life exceeds 10 6 is considered as the fatigue strength. The S-N curves of Al foams and 3.0-wt %-CNT reinforced AMCFs are shown in Figure 5.…”

Deformation and Strength Properties Prediction of Metals With Uniformly Distributed Closed Pores Under Single and Cyclic Loading

“…В статьях Крамбергера (J. Kramberger) с соавторами [21,22] для среды с регулярной и квазирегулярной структурой пор в двумерной постановке (плоское деформированное состояние) предложен критерий, связывающий накопление повреждения материалом с диссипацией энергии, определяемой параметрами петли неупругого гистерезиса в стабильном цикле. Заслуживает упоминания исследование Линуля (Е. Linul) с соавторами [23], предметом которого являлась модель малоцикловой усталости алюминиевого сплава с хаотично распределенными по объему закрытыми порами.…”