亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整的填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Dynamic Mechanical Behavior of the Frozen Red Sandstone under Coupling of Saturation and Impact Loading

饱和(图论) 材料科学 脆性 分离式霍普金森压力棒 复合材料 岩土工程 地质学 应变率 数学 组合数学
作者
Junce Xu,Hai Pu,Ziheng Sha
出处
期刊:Applied sciences [MDPI AG]
卷期号:12 (15): 7767-7767 被引量:7
标识
DOI:10.3390/app12157767
摘要

Saturation is one of the critical factors causing frost damage to rock masses in alpine regions, and dynamic stress perturbations further complicate the damage process. Therefore, the effects of water content and loadings should be considered in the construction and maintenance of rock structures during winter in cold regions. In this study, the effects of saturation and impact loading on the dynamic mechanical behavior of frozen red sandstone were investigated using a low-temperature split Hopkinson pressure bar system (LT-SHPB). By combining low-field nuclear magnetic resonance (LF-NMR) and scanning electron microscopy (SEM), the dynamic evolution of the microstructure of the frozen sandstone due to changes in saturation was investigated. The results indicated that the increase of saturation reshapes the pore structure of the frozen sandstone and promotes the expansion of pores of different sizes during freezing, while at complete saturation the frozen samples are mainly developed with meso- and macropores. The dynamic strength, elastic modulus, and brittleness index of the frozen sandstone under impact loading, which are limited by the critical saturation Src, tend to increase and then decrease with saturation. For the four impact loads, the dynamic strength of the samples increased by 21.2%, 27.1%, 32.5%, and 34.3% when the saturation was increased from 0 to 50%, corresponding to 1.38, 1.43, 1.51, and 1.56 times the dynamic strength of the fully saturated samples, respectively. In contrast, the ultimate deformation capacity of the frozen sandstone showed an opposite trend with saturation. As the impact load increases, the dynamic strength, elastic modulus, and peak strain of the frozen sandstone show a significant strengthening effect due to the increase in strain rate, while its brittleness index gradually decreases, dropping by 11.2% at full saturation. In addition, the energy dissipation capacity of the frozen sample first increases and then decreases with increasing saturation, with the enhancement effect of saturation on energy dissipation smaller than the weakening effect.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
5秒前
LL发布了新的文献求助10
11秒前
14秒前
么么么发布了新的文献求助10
19秒前
29秒前
么么么完成签到 ,获得积分10
40秒前
41秒前
李九妹完成签到 ,获得积分10
45秒前
经冰夏完成签到 ,获得积分10
48秒前
48秒前
科研通AI2S应助科研通管家采纳,获得10
54秒前
科研通AI2S应助科研通管家采纳,获得10
54秒前
大个应助含蓄戾采纳,获得10
57秒前
轩仔发布了新的文献求助10
1分钟前
1分钟前
NCL完成签到,获得积分10
1分钟前
1分钟前
好巧完成签到,获得积分10
1分钟前
含蓄戾完成签到,获得积分10
1分钟前
1分钟前
含蓄戾发布了新的文献求助10
1分钟前
医者仁心完成签到,获得积分10
1分钟前
Julie发布了新的文献求助10
1分钟前
打打应助NCL采纳,获得10
1分钟前
搜集达人应助材料摆渡人采纳,获得10
1分钟前
1分钟前
choyng发布了新的文献求助10
1分钟前
科研通AI2S应助XIN采纳,获得10
1分钟前
热带蚂蚁完成签到 ,获得积分10
1分钟前
2分钟前
2分钟前
2分钟前
樱桃猴子应助Julie采纳,获得10
2分钟前
NCL发布了新的文献求助10
2分钟前
木木发布了新的文献求助10
2分钟前
研友_VZG7GZ应助CSun采纳,获得10
2分钟前
Jason发布了新的文献求助10
2分钟前
林非鹿完成签到,获得积分10
2分钟前
himat完成签到,获得积分10
2分钟前
Jason完成签到,获得积分10
2分钟前
高分求助中
Evolution 10000
Sustainability in Tides Chemistry 2800
The Young builders of New china : the visit of the delegation of the WFDY to the Chinese People's Republic 1000
юрские динозавры восточного забайкалья 800
English Wealden Fossils 700
Foreign Policy of the French Second Empire: A Bibliography 500
Chen Hansheng: China’s Last Romantic Revolutionary 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3146703
求助须知:如何正确求助?哪些是违规求助? 2798015
关于积分的说明 7826470
捐赠科研通 2454516
什么是DOI,文献DOI怎么找? 1306328
科研通“疑难数据库(出版商)”最低求助积分说明 627704
版权声明 601522