Researchers at North Carolina State University designed the morpho‑interlocking protective module, or MIPM, to curl into a protective shell for delicate items like soft robots and flexible electronics. The idea comes from armadillos and aims to combine flexibility with impact protection.
The MIPM has three main layers: an outer exoskeleton of segmented curved scales made with 3D printing, a middle sensing and actuation layer, and an endoskeleton of folded ridges that hold rigid segmental scales. The sensing layer detects strain and sends a signal to a control unit, which powers a heater.
When the heater warms, a soft active material contracts and another layer expands so the whole structure curves and the scales lock together. In tests the sensor triggered this transformation, and adding more segmental scales increased rigidity. The team noted a trade‑off between segmentation and making the structure lightweight; for example, ten segmental scales could withstand about ten newtons of force. The paper appears in Science Advances.
Difficult words
- exoskeleton — hard outer covering of an animal or device
- endoskeleton — internal supporting structure inside an animal or object
- segmented — divided into separate connected parts
- actuation — the process of making something move or operate
- strain — force or pressure that stretches material or parts
- rigidity — quality of being stiff and not easily bent
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Discussion questions
- Would you use a device like the MIPM to protect a fragile object you own? Why or why not?
- How can studying animals, like armadillos, help engineers design new technology? Give one example.
- Which is more important for protective devices: flexibility or rigidity? Explain your opinion with a reason.
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