Chao Chen
23 posts
“今天我们在白宫进行了一次非常有意义的会晤。了解了很多只有在这种激烈的气氛和压力下进行对话才能理解的事情。情绪之下流露出的东西是难以想象的。我已经确定，如果美国介入，泽连斯基总统就没做好和平的准备，因为他觉得我们的介入会给他在谈判中带来很大的优势。我要的不是优势，我要的是和平。他在美国珍视的椭圆形办公室里不尊重美利坚合众国。他可以等自己为和平做好准备的时候再回来。”——唐纳德·J·特朗普总统
President Donald J. Trump@POTUS
“We had a very meaningful meeting in the White House today. Much was learned that could never be understood without conversation under such fire and pressure. It’s amazing what comes out through emotion, and I have determined that President Zelenskyy is not ready for Peace if America is involved, because he feels our involvement gives him a big advantage in negotiations. I don’t want advantage, I want PEACE. He disrespected the United States of America in its cherished Oval Office. He can come back when he is ready for Peace.” –President Donald J. Trump
中文
Chao Chen retweetledi
Submit abstracts by Oct 25! @chenchao04 (3M), Hyunki Kim (3M), and I are organizing a focus session on “Mechanics and Polymer Physics of Soft Adhesives (@APS_DPOLY, @ApsDsoft)”, at the 2025 APS March Meeting. Invited speaker features @HyunwooYuk @SanaHeal. aps.org/events/2025/jo…
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@zhigangsuo @rhpume It’s such a great pleasure and honor to host you in 3M campus. Thank you for the great talk in fracture and fatigue, as well as the insightful discussion, which were really educational and inspiring in 3M!
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Chao Chen retweetledi
Today I visited 3M, gave a seminar, and had technical discussions.
At lunch I asked, “What makes 3M work?”
“Culture,” a longtime 3Mer replied. It is heartwarming to see people take pride in their organization.
That culture was articulated a long time ago.
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Chao Chen retweetledi
Exciting news! 🎉 Congratulations to Prof. Al Crosby for starting as the head of Polymer Science and Engineering @UMassPSE! We from Crosby group are very proud of you and excited to see your passion for science achieving great heights in academic excellence! @aljcrosby #research
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@ShiQingWang4 @QihanLiu1 @zhigangsuo @RuobingB The length scale was derived from the 1/r crack-tip singularity of the strain energy density. The original analysis of this energy singularity was firstly shown in Jim Rice’s HRR paper, so we assume it’s valid at least for metals. His approach was very generic based on J-integral
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@zhigangsuo : there must be calculations, numerical simulations of how embedded flaws - cracks, not the through cracks, produce any stress intensification. I can tell if the flaw size is only a fraction of the sample thickness, there is little effect. Any literature you know?
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@SVDODD @zhigangsuo @ShiQingWang4 @RuobingB I think this length as a material property does rely on material chemicals which defines a material.
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@zhigangsuo @ShiQingWang4 @RuobingB @chenchao04 In metal working,say air bending or bottoming,most high tensile steels crack if radius is less than 1.5xthickness
Sometimes it doesn't even radius=thickness
Poor carbon control causes occasional cracks flaws.fractocohesive length depends on Chemical properties or anything else?
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A creeping but not necking material can make Lamian/Ramen/pulled noodles. Many noodle experts from Suo group. @RuobingB @KejieZhao
Chao Chen@chenchao04
A fun demonstration for solid mechanics class. A play-dough shows necking.
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@KejieZhao @DrJiaweiYang If you guys can start an International Journal of Educational Mechanics 😄
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@DrJiaweiYang @chenchao04 The experimentalist should be first author
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Chao Chen retweetledi
The @UMassPSE community is looking forward to this Friday's virtual seminar on underwater adhesion! Hosted by @aljcrosby - Professor Marleen Kamperman is visiting from @univgroningen #UMassPSE #polymers
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@zhigangsuo @CretonCost @EnduricaWill @EnduricaChris @yecheng_w @jasongsteck @SammyHassan_ @Junsoo_twit @ShiQingWang4 We had a lot of discussion on the physical significance of this dimension, but it was not clear. We decided a brief mention in the flaw sensitivity paper— We hid behind the giant. It becomes clearer when related to the intrinsic dissipation.
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Greensmith 1960 doi.org/10.1002/app.19…
revisited the relation T = Ed of Thomas 1955.
1 For an incision made by a cutter, d is the diameter of the incision tip, and is not a material property.
2 For a continuously growing cut, d is a material property.
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People do not consistently name these two quantities:
A. Toughness (J/m2), Gc, measured using a sample with a precut crack.
B. Work of fracture (J/m3), Wc, measured using a sample with no precut crack.
They have different units. Be careful how each paper names them.
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Thank you all for having me working in the program!
Al Crosby@aljcrosby
HFSP is such a great program. Love being a part of this team! @Beverley_CUBG and Michel Milinkovitch!
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My first co-authored paper in Langer/Anderson lab is published in JACS! We design combinatorial chemistry to fabricate biocompatible hydrogel fibers that can tune a broad range of mechanical properties and show large deformation-humidity coupling.
pubs.acs.org/doi/10.1021/ja…
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Check out our latest paper in
@AdvSciNews on flower-inspired broad-angle structural color through tunable hierarchical wrinkles, a collaborative work between @Crosby__Group and
@Beverley_CUBG ! onlinelibrary.wiley.com/doi/10.1002/ad…
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