#fractofact - Twitter Hashtag

over 4 years ago

#fractofact fragmentation of a balloon The internal pressure stretches the balloon. The ball penetrates the balloon and create multiple cracks. The time is so short that the inertia keeps the balloon stretched, which drives the multiple cracks to extend.

Cliff Pickover

@pickover

over 4 years ago

Physics, elasticity, material deformation. Bowling ball vs giant balloon. Source: https://t.co/NKp4MOXg0F

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Zhigang Suo @zhigangsuo

over 4 years ago

#fractofact 1/2 The concepts of elastic dissipater and stress de-concentration can even make metals and plastics fatigue-resistant. @jasongsteck @GuogaoZhang @Christine_h_ahn @AtteKadoma @QuanJiao @GuodongNian @XianyangB @yecheng_w

Zhigang Suo @zhigangsuo

over 4 years ago

Both elastic and inelastic dissipaters can have high toughness, resisting crack growth under monotonic load. Elastic dissipaters can have high fatigue threshold, resisting crack growth under cyclic load Inelastic dissipaters have low fatigue threshold. https://t.co/luzxcm5uFX

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Zhigang Suo @zhigangsuo

over 4 years ago

In discussing with colleagues and teaching, it helps to have facts in mind, sharply. I’ll gather threads on such facts, keeping each fact basic, and each thread short. #threadsofpolymers, polymer #thermofact, thermodynamics #fractofact, fracture #beinglinear, linear algebra

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Zhigang Suo @zhigangsuo

over 4 years ago

#fractofact The use of energy release rate as a load parameter to drive crack extension dates back at least to Obreimoff (1930). This practice is unusual because energy release rate is defined by elasticity, which allows no dissipation, but crack extension dissipates energy.

Zhigang Suo @zhigangsuo

about 6 years ago

1930 Obreimoff The Splitting strength of mica Happy childhood of a subject! A delightful paper with no affectation. G for a beam Mica heals fully. Splitting generates light and charge. v-G curve G depends on environment @jasongsteck @Junsoo_twit https://t.co/Cgcn0ScwRG

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Zhigang Suo @zhigangsuo

over 4 years ago

#fractofact Elastic dissipaters include ceramics, elastomers, trusses, fabrics, and composites. Toughness of an elastic dissipater exceeds surface energy. For many elastic dissipaters, toughness is orders of magnitude times the surface energy.

Zhigang Suo @zhigangsuo

about 6 years ago

An elastomer is an ultimate fiber composite. https://t.co/x44nNYG2cE 1. A polymer chain acts as a fiber of ideal strength. 2. Low interchain friction de-concentrates stress: before a bond breaks, all bond in a chain stretch near break. 3. Crosslinks maintain elasticity.

zhigangsuo's tweet photo. An elastomer is an ultimate fiber composite. https://t.co/x44nNYG2cE

1. A polymer chain acts as a fiber of ideal strength.

2. Low interchain friction de-concentrates stress: before a bond breaks, all bond in a chain stretch near break.

3. Crosslinks maintain elasticity. https://t.co/cFZ5P2n4i5

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Zhigang Suo @zhigangsuo

over 4 years ago

#fractofact Griffith (1921) analyzed fracture as a reversible process, but fracture is an irreversible process. Two forms of irreversibility: ☝️Inelastic dissipater (Orowan-Irwin 1948) ✌️Elastic dissipater (Lake-Thomas 1967) @ShiQingWang4 @CretonCost @jdolbow @SGovindjee

Zhigang Suo @zhigangsuo

over 4 years ago

Toughness Gc for silica is several times surface energy. Even in silica, fracture is a dissipative process. In addition to creating surfaces, fracture creates sound, changes temperature, etc. Gc for brittle steel in on the order of 1000 J/m2.

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