Results 91 to 100 of about 2,632 (215)

Failure analysis of a bottom hole motor attached to a coiled tubing

Forces in Mechanics
During well operations in Mexico, a weight loss incident occurred, accompanied by the detachment of a section of the Bottom Hole Motor (BHM) connected to coiled wellbore tubing.
A. Albiter, Lucila Cruz-Castro, A. Contreras   +2 more
doaj   +1 more source

Highly Entangled Bottlebrush Polymer Networks

Advanced Materials, EarlyView.
Bottlebrush polymers are difficult to entangle, enabling ultrasoft yet brittle networks. We report highly entangled bottlebrush elastomers that remain ultrasoft (∼1 kPa) yet stretch to ∼1800% and exhibit exceptional fatigue resistance. Their intrinsic fatigue strength—fatigue threshold normalized by modulus—surpasses that of highly entangled linear ...
Myoeum Kim, Baiqiang Huang, Shiwang Cheng, Li‐Heng Cai   +3 more
wiley   +1 more source

A METHOD MEASURING FRACTURE PARAMETERS OF BRITTLE MATERIAL USING U-NOTCHES

Jixie qiangdu, 2015
Based on two stress criterions（ the maximum circumferential stress criterion and average circumferential stress criterion） for U-notches under Mode-I,relationships among the critical notch stress intensity factor,the fracture toughness and the tensile ...
LIU XiaoMei, BIAN YongMing, LIANG YongCheng   +2 more
doaj  

Reevaluating brittleness in material selection: Why fracture toughness alone is insufficient

Materials & Design
Material selection methods commonly rely on fracture toughness attribute limits to screen out brittle materials. However, this approach can lead to overly restrictive exclusions of ductile materials with low toughness and the unintended inclusion of high-
Michelle Hedvard, Maja Eichler, Philipp Weißgraeber   +2 more
doaj   +1 more source

Field‐Programmed Anisotropy in Magneto‐Piezoelectric Composites for Material‐Encoded Mechanoperception

Advanced Materials, EarlyView.
Field‐programmed anisotropy imparts material‐level intelligence to soft composites. Magnetic torque dynamics drive magneto‐piezoelectric nanowires from random dispersion into deterministic axial alignment. The resulting hierarchical percolation networks confine electromechanical coupling to specific axes and intrinsically decouple superposed force ...
Yubin Kim, Yumin Kwon, Dabin Kim, Minsun Oh, Jin Young Jung, Dongyeong Gim, Kootak Hong, Jun Yeon Hwang, Sang‐Woo Kim, Minjeong Ha   +9 more
wiley   +1 more source

Can Elastomers Combine Stiffness, Toughness and Fatigue Resistance?

Advanced Materials, EarlyView.
This review studies how the molecular and macroscopic architecture of elastomers influence their mechanical properties including: stiffness, stretchability, toughness, fatigue resistance, and damping behavior. By linking the structure to performance, it proposes design principles for advanced elastomeric systems that combine mechanical properties ...
Eva Baur, Esther Amstad
wiley   +1 more source

Hybrid Amyloid–Boron Nitride Aerogels for Lightweight Sound Insulation

Advanced Materials, EarlyView.
Amyloid fibrils template the mild formation of boron nitride–rich hybrid aerogels with hierarchical porosity, enhanced BN‐like ordering, and fibril‐reinforced mechanics. These ultralight materials combine thermal stability with strong sound absorption and transmission loss, offering a sustainable bio‐assisted route toward lightweight acoustic shields ...
Mohammad Peydayesh, Andrin Lustgarten, Stefan Schoenwald, Enrico Boschi, My Hanh Bui, Ali Miserez, Felix Donat, Christoph R. Müller, Raffaele Mezzenga   +8 more
wiley   +1 more source

Brittle and ductile yielding in soft materials

Proceedings of the National Academy of Sciences
Many soft materials yield under mechanical loading, but how this transition from solid-like behavior to liquid-like behavior occurs can vary significantly. Understanding the physics of yielding is of great interest for the behavior of biological, environmental, and industrial materials, including those used as inks in additive manufacturing and muds ...
Krutarth M. Kamani, Simon A. Rogers
openaire   +2 more sources

Photoactivable Surfactant Design for In Situ Stabilization of Hydrogel Bioelectronics

Advanced Materials, EarlyView.
Photoactivable surfactant additive enables in situ stabilization of hydrogel bioelectronics. ABSTRACT Conductive polymer hydrogels offer unique advantages for soft, stretchable biointerfaces by combining tissue‐like mechanics with high ionic conductivity.
Seungyeon Lee, Donggyun Lee, Soo‐Hwan Lee, Yuri Lee, Jooyeun Chong, Gunho Chang, Hyunjun Kim, Aejin Kim, Kyung Su Kim, Jahyun Koo, Hyojin Lee, Jiheong Kang   +11 more
wiley   +1 more source

Fluorinated Deep Eutectic Gel Electrolytes with Simultaneously Enhanced Mechanical Strength and Ionic Conductivity for Solid‐State Lithium Metal Batteries

Advanced Materials, EarlyView.
The synergistic integration of rigid polyacrylamide (PAM) and flexible poly(N,N‐dimethylacrylamide) (PDMA) phases offers exceptional toughness to suppress lithium dendrites, simultaneously enhancing mechanical strength and ionic conductivity. ABSTRACT Gel polymer electrolytes for lithium‐metal batteries face an inherent trade‐off between mechanical ...
Hao Long, Yuhao Liang, Ting He, Xueming Chen, Zimo Huang, Hao Chen, Shanqing Zhang   +6 more
wiley   +1 more source