Crumpling an ordinary thin sheet transforms it into a structure with unusual mechanical behaviors, such as enhanced rigidity, emission of crackling noise, slow relaxations, and memory retention. A central challenge in explaining these behaviors lies understanding the contribution complex geometry sheet. Here we combine cyclic driving protocols three-dimensional (3D) imaging to correlate global response underlying geometric transformations unfolded crumpled sheets. We find that their strain...

We study disordered networks of coupled bistable elastic elements, representing a coarse-grained view amorphous solids. find that such self-organize to marginally stable state, in which the barrier for local activations becomes vanishingly small. The model provides unique access both and global properties associated with marginal stability. directly measure pseudo-gaps spectrum excitations, as well diverging fluctuations under shear. Crucially, dynamics are dominated by small population...

Abstract Ordered mechanical systems typically have one or only a few stable rest configurations, and hence are not considered useful for encoding memory. Multistable history-dependent responses usually emerge from quenched disorder, example in amorphous solids crumpled sheets. In contrast, due to geometric frustration, periodic magnetic can create their own disorder espouse an extensive manifold of quasi-degenerate configurations. Inspired by the topological structure frustrated artificial...

Disordered and amorphous materials often retain memories of perturbations they have experienced since preparation. Studying such is a gateway to understanding this challenging class systems. However, it requires the ability measure local structural changes in response external drives. Here, we show that dissipation generic macroscopic indicator memory largest perturbation. Through experiments crumpled sheets under cyclic drive, transiently increases when first surpassing perturbation due...

The recent finding of collective actuation in active solids-solids embedded with units-is a new promise for the design multifunctional materials genuine autonomy, and better understanding dense biological systems. Here, we combine experimental study centimetric model solids, numerical an agent-based model, theoretical arguments to reveal form how mechanical tension can serve as general mechanism transitioning between different regimes. presence hysteresis when varying back forth highlights...

The response of driven frustrated media stems from interacting hysteretic elements. We derive explicit mappings networks springs to their abstract representation as hysterons. These reveal how the physical network controls signs, magnitudes, symmetries, and pairwise nature hysteron interactions. In addition, strong geometric nonlinearities can produce pathways that require excess hysterons or even break models. Our results pave way for metamaterials with geometrically controlled...

Disordered materials under an imposed forcing can display creep and aging effects, accompanied by intermittent, spatially heterogeneous dynamics. We propose a unifying microscopic description of these phenomena, based on the notion that as system ages, density local barriers enable relaxation displays slowly evolving gap. As result, dynamics is dominated activation lowest, extremal tail distribution. This framework predicts logarithmic creep, well correlated bursts slow activated...

Here we report on an optical delay device for high-power laser, with a temporal range of 0-90 nanoseconds. The is intended studies laser-electron acceleration using the exploding foil method. A compact 3D mounted design implemented, which enables performance at high repeatability and low beam- distortion.

The sequential response of driven frustrated media encodes memory effects and hidden computational capabilities. While abstract hysteron models can capture these effects, they require phenomenologically introduced interactions, limiting their predictive power. Here we introduce networks bistable elements - physical hysterons whose interactions are controlled by the networks' geometry. These realize a wide range previously unobserved exotic pathways, including those that surpass current...

We study networks of coupled bistable elastic elements, recently proposed as a model for crumpled thin sheets. The are poised on the verge localized instability, and allows unique access to both local global properties associated with marginal stability. directly measure pseudo-gaps in spectrum excitations, well diverging fluctuations under shear. also host quasi-localized, low-frequency vibrational modes, scale-free avalanches instabilities. propose correction scaling between pseudo-gap...

Many complex and disordered systems fail to reach equilibrium after they have been quenched or perturbed. Instead, sluggishly relax toward at an ever-slowing, history-dependent rate, a process termed physical aging. The microscopic processes underlying the dynamic slow-down during aging reason for its similar occurrence in different remain poorly understood. Here, we reveal structural mechanism logarithmic mechanical systems, through experiments crumpled sheets simulations of network...

Disordered and amorphous materials often retain memories of perturbations they have experienced since preparation. Studying such is a gateway to understanding this challenging class systems, yet it requires the ability measure local structural changes in response external drives. Here we show that dissipation generic macroscopic indicator for memory largest perturbation. Through experiments crumpled sheets under cyclic drive, transiently increases when first surpassing perturbation due...

Ordered mechanical systems typically have one or only a few stable rest configurations, and hence are not considered useful for encoding memory. Multistable history-dependent responses usually emerge from quenched disorder, example in amorphous solids crumpled sheets. In contrast, due to geometric frustration, periodic magnetic can create their own disorder espouse an extensive manifold of quasi-degenerate configurations. Inspired by the topological structure frustrated artificial spin ices,...