Douglas Holmes

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Douglas Holmes

Douglas Holmes

@dpholmes

professor of theoretical and applied mechanics at Boston University, songwriter (@dougholmesmusic), surfer, father.

Boston Katılım Mayıs 2009
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Douglas Holmes
Douglas Holmes@dpholmes·
In honor of Sophie Germain's birthday, take a minute to read about her contributions to elasticity: arxiv.org/abs/2303.13615
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Douglas Holmes
Douglas Holmes@dpholmes·
The opening of the the Devil’s Finger fungus looks analogous to some work we did with @LiquidsLab did a while back looking at bilayer bending from swelling vs capillary adhesion.
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Douglas Holmes
Douglas Holmes@dpholmes·
To demonstrate the strength of this model, we use to predict the shapes of wavy leaves (sect. 7.1), the snapping of a Venus flytrap (sect. 7.2), and the voltage-induced buckling of dielectric elastomers. These predictions are made from simple experimental measures of strain.
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Douglas Holmes
Douglas Holmes@dpholmes·
Natural stretch and natural curvature can be measured by considering how two orthogonal beams at each point stretch and bend. These are the "natural" quantities because beams are not constrained by geometry.
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Douglas Holmes
Douglas Holmes@dpholmes·
We've been working for years to develop a general theory that describes how slender structures respond to non-mechanical stimuli (e.g. swelling; growth; electromagnetic fields). Today we are delighted to present our: "Stimuli-responsive shell theory" journals.sagepub.com/doi/10.1177/10…
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Douglas Holmes
Douglas Holmes@dpholmes·
Reading a novel, I feel personally attacked: “Would you by any chance be familiar with certain notions concerning bifurcations in dissipative structures?” “I most certainly would not. In fact if I had to be I hope I’d kill myself.” - Denis Johnson (Already Dead)
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Douglas Holmes
Douglas Holmes@dpholmes·
It's not everyday your favorite science writer writes about your work... thanks for the great article, @philipcball !
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Douglas Holmes
Douglas Holmes@dpholmes·
@csantangelo314 @softmattrtheory @AlexanderRKlotz I only yesterday learned the trick to multiple by 9 using your fingers. (put out your hands, going from left to right go to the digit you'd like to multiply by 9. bend that finger. the # of fingers to the left of it is the 10's digit, to the right the 1's digit.)
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Alex Klotz
Alex Klotz@AlexanderRKlotz·
Seems most people think graduates should be able to do some basic calculations in their head, but not far beyond that. Personally I think they should pick up more just through the course of their degrees, but that's not actually taught so it's hard to make it an expectation.
Alex Klotz@AlexanderRKlotz

@dvs1444 plz share. How much mental arithmetic should a student finishing a degree in science or engineering be able to do?

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Douglas Holmes
Douglas Holmes@dpholmes·
I am definitely intrigued about Morpho!
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Douglas Holmes
Douglas Holmes@dpholmes·
@mengersponge @crollab I ended up using this paper as the (rough outline) of how to model origami structures - great paper!! In class, we folded waterbomb bases (various n) and miura-ori. Then we did a few demos examining d-cones. Fun lecture!
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Douglas Holmes
Douglas Holmes@dpholmes·
I'd like to include a lecture in my Structural Mechanics course on origami. These are 4th year MechE's. We will fold the miura and waterbomb base in class. Origami Twitter: What core ideas/concepts in origami should students at this level be introduced to?
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Douglas Holmes
Douglas Holmes@dpholmes·
@zhigangsuo I wonder if we can be more creative in our mechanical reuse. I think mechanical metamaterials can play a role here. If structure and shape determine function, can we apply these ideas to materials that are difficult to recycle?
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Zhigang Suo
Zhigang Suo@zhigangsuo·
Mechanical recycling, the most popular recycling method today, separates plastics, washes them, and melts them to produce new plastics. Mechanical recycling is sensitive to contaminants such as food and additives, and can reduce polymer length and degrade properties.
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Douglas Holmes
Douglas Holmes@dpholmes·
@crollab Any readings/papers you recommend (trying to collect some good materials)
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