RILEM recommendation MDT. D.3—Determination “in situ” of the adhesive strength of rendering and plastering mortars to their substrate

2004 ◽  
Vol 37 (7) ◽  
pp. 488-490 ◽  
Keyword(s):  
Adhesive Strength ◽  
Rilem Recommendation

scholarly journals Statistical properties of defect-dependent detachment strength in bioinspired dry adhesives

2019 ◽  
Vol 16 (156) ◽  
pp. 20190239 ◽  
Author(s):  
Jamie A. Booth ◽  
Verena Tinnemann ◽  
René Hensel ◽  
Eduard Arzt ◽  
Robert M. McMeeking ◽  
...  
Keyword(s):  
Adhesive Strength ◽  
Strength Distribution ◽  
Statistical Properties ◽  
Critical Defect ◽  
Dry Adhesives ◽  
Critical Defect Size ◽  
Surface Microstructures ◽  
Secondary Mechanism

Dry adhesives using surface microstructures inspired by climbing animals have been recognized for their potentially novel capabilities, with relevance to a range of applications including pick-and-place handling. Past work has suggested that performance may be strongly dependent on variability in the critical defect size among fibrillar sub-contacts. However, it has not been directly verified that the resulting adhesive strength distribution is well described by the statistical theory of fracture used. Using in situ contact visualization, we characterize adhesive strength on a fibril-by-fibril basis for a synthetic fibrillar adhesive. Two distinct detachment mechanisms are observed. The fundamental, design-dependent mechanism involves defect propagation from within the contact. The secondary mechanism involves defect propagation from fabrication imperfections at the perimeter. The existence of two defect populations complicates characterization of the statistical properties. This is addressed by using the mean order ranking method to isolate the fundamental mechanism. The statistical properties obtained are subsequently used within a bimodal framework, allowing description of the secondary mechanism. Implications for performance are discussed, including the improvement of strength associated with elimination of fabrication imperfections. This statistical analysis of defect-dependent detachment represents a more complete approach to the characterization of fibrillar adhesives, offering new insight for design and fabrication.

In situ photocrosslinkable hyaluronic acid-based surgical glue with tunable mechanical properties and high adhesive strength

2018 ◽  
Vol 57 (4) ◽  
pp. 522-530 ◽  
Author(s):  
Ajeesh Chandrasekharan ◽  
Keum-Yong Seong ◽  
Sang-Gu Yim ◽  
Sodam Kim ◽  
Sungbaek Seo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hyaluronic Acid ◽  
Adhesive Strength ◽  
Tunable Mechanical Properties ◽  
High Adhesive Strength

Rendez vous with Saturn's rings

1984 ◽  
Vol 75 ◽  
pp. 743-759 ◽  
Author(s):  
Kerry T. Nock
Keyword(s):  
Solar Energy ◽  
Electric Propulsion ◽  
Power Source ◽  
Propulsion System ◽  
Low Thrust ◽  
Ring Plane ◽  
The Earth ◽  
Total Impulse ◽  
Saturn's Rings

ABSTRACTA mission to rendezvous with the rings of Saturn is studied with regard to science rationale and instrumentation and engineering feasibility and design. Future detailedin situexploration of the rings of Saturn will require spacecraft systems with enormous propulsive capability. NASA is currently studying the critical technologies for just such a system, called Nuclear Electric Propulsion (NEP). Electric propulsion is the only technology which can effectively provide the required total impulse for this demanding mission. Furthermore, the power source must be nuclear because the solar energy reaching Saturn is only 1% of that at the Earth. An important aspect of this mission is the ability of the low thrust propulsion system to continuously boost the spacecraft above the ring plane as it spirals in toward Saturn, thus enabling scientific measurements of ring particles from only a few kilometers.

Sign in / Sign up

Export Citation Format

Share Document