Small Radius Of Curvature Research Articles

A minimal model to study self-excited vibrations of a tram wheelset in curves with small radius of curvature

A wheelset of a rail vehicle may experience stability issues in curves with a small radius of curvature, which are typical for tramway networks. Accompanied self-excited vibrations of the wheelset might be a potential mechanism of adverse wheel polygonization, although a possible relationship between the two phenomena is not addressed here. A basic 2-DOF model, representing a wheelset with non-driven, independently rotating resilient wheels, has been derived from the analysis of simulation results with a more detailed system model to understand the reasons for a possibly unstable motion in a uniform curve. It has been found that a dominating motion in the regime with a negative gradient of the lateral creep force–creepage characteristics is necessary for possible self-excitation but is not sufficient for the considered parameter range. The combination and interaction of the lateral oscillations of the resilient wheel and laterally elastic wheelset axle is essential for amplification. Resulting stable limit cycles can be observed, and influences on corresponding amplitudes are discussed. The lateral flexibility of the wheelset axle appears as an important influence.

金型内における自動車外板パネルの線ずれ形成過程の測定

The appearance of an automobile is one of the appealing points to customers. Character lines in outer panels such as hood and door panels play an important role in making automobiles attractive, and a sharp character line with a ridge of small curvature radius is much more preferred to a blunt character line. However, a skid line, a type of cosmetic defect, is apt to be generated along the character line during the press forming of a sharp character line. The authors revealed the mechanism of skid line generation by finite element analysis, and reported the results in a previous paper. In this study, a method is developed to continuously measure the panel shape during press forming. The results of the shape measurement suggest that a convex shape formed on the die ridge should move to a flat area of the die that a wavy shape should generate there immediately before the convex shape is flattened at the bottom dead center and that the wavy shape should grow to a skid line through springback.

Quantitative investigation of the validity conditions for the Beckmann–Kirchhoff scattering model

Approximate and rigorous methods are widely used to model light scattering from a surface. The boundary element method (BEM) is a rigorous model that accounts for polarization and multiple scattering effects. BEM is suitable to model the scattered light from surfaces with complex geometries containing overhangs and re-entrant features. The Beckmann–Kirchhoff (BK) scattering model, which is an approximate model, can be used to predict the scattering behavior of slowly varying surfaces. Although the approximate BK model cannot be applied to complex surface geometries that give rise to multiple scattering effects, it has been used to model the scattered field due to its fast and simple implementation. While many of the approximate models are restricted to surface features with relatively small height variations (typically less than half the wavelength of the incident light), the BK model can predict light scattering from surfaces with large height variations, as long as the surfaces are locally flat with small curvatures. Thus far, attempts have been made to determine the validity conditions for the BK model. The primary validity condition is that the radius of curvature of any surface irregularity should be significantly greater than the wavelength of the light. However, to have the most accurate results for the BK model, quantifying the validity conditions is critical. This work aims to quantify the validity conditions of the BK model according to different surface specifications, e.g., slope angles (SA) and curvatures. For this purpose, the scattered fields from various sinusoidal and combinations of sinusoidal profiles are simulated using the BEM and the BK models and their differences are compared. The result shows that the BK model fails when there are high SA ( ⪆ 38 deg) and small radii of curvature ( ⪅ 10 λ) within a sinusoidal profile. Moreover, it is shown that for a combination of sinusoidal profiles the BK model is valid for profiles with a high maximum slope angle value ( ⪆ 38 deg) if the average of positive SA is low ( ⪅ 5 deg).

Corrections of Mesoscale Eddies and Kuroshio Extension Surface Velocities Derived from Satellite Altimeters

Oceanic datasets derived from satellite altimeters are of great significance to physical oceanography and ocean dynamics research and the protection of marine environmental resources. Ageostrophic velocity induced by centrifugal force is not considered in altimeter products. This study introduces an iterative method to perform cyclogeostrophic corrections of mesoscale eddies’ surface velocities derived from satellite altimeters. The corrected eddy velocity field and geostrophic velocity field were compared by combining eddy detection and mathematical statistics methods. The results show that eddies with small curvature radii, high roundness, or Rossby number larger than 0.1 illustrate that cyclogeostrophic correction is required. The cyclogeostrophic velocity is greater (less) than the geostrophic velocity in anticyclonic (cyclonic) eddies. Additionally, the iterative method is applied to cyclogeostrophic-corrected multi-year (1998–2012) Kuroshio surface velocities. The effect of cyclogeostrophic correction is significant for the Kuroshio Extension region, where the maximum relative difference of velocities with and without correction is about 10% and the eddy kinetic energy is 20%.

The Effects of High Centrifugal Acceleration on Bluff-Body Stabilized Premixed Flames

Abstract An experimental study is conducted on bluff-body stabilized premixed flames in a curved, square cross section duct. High flow velocities coupled with a small radius of curvature of the duct induce high centrifugal acceleration normal to the flame sheet. A cylindrical flame holder spans the width of the square cross section and is positioned at the channel midheight. Flame shear layers are stabilized on the radially inward (upper) and outward (lower) edges of the flame holder. Side-view high-speed Schlieren images and high-speed pressure measurements are captured. Static stability, overall pressure loss, and statistics and velocimetry results from the Schlieren images are reported, and results are compared to a straight configuration with no centrifugal acceleration. Two bluff-body diameters are studied to show the effect of flame holder diameter on static stability. For the curved configuration, blowout velocities are higher for the smaller bluff-body diameter, likely due to flow acceleration effects. Blowout velocities are lower for the curved configuration compared to the straight configuration which may be due to the destabilizing Rayleigh–Taylor (RT) effect on the upper flame layer. Overall pressure loss is slightly higher for the curved configuration than the straight configuration. High-speed Schlieren results show centrifugal acceleration causes significant structural and velocimetric asymmetry in the bluff-body wake. In the curved configuration, the upper flame layer displays destabilizing RT instabilities, and the lower flame layer displays stabilizing RT effects. The upper flame shows vigorous RT instabilities which broaden the flame brush and sustain a flame leading edge independent of inlet Reynolds number or velocity. Conversely, the lower flame exhibits suppression of Kelvin–Helmholtz and flame-generated instabilities in the wake, which confines the flame brush and significantly reduces transverse flame velocities. The lower flame edge profile moves toward the channel centerline with increasing inlet Reynolds number. The upper flame in the curved configuration shows higher flame edge velocities than the straight configuration while the lower flame shows velocities closer to zero. The empirical constant to the power law relation for upper flame edge velocities agrees with RT-dominated flame growth theory for this experimental scale and agrees with other RT-dominated flame studies.

Factors affecting the radius of curvature of circular braids

Marudai is a tool for making traditional braids, Kumihimo. It can produce braids of various cross-sectional shapes. Most of the braids are straight braids, but in a previous study, a circular braid was manufactured for the first time using a traditional technique called Marugenji-gumi. In this study, the same manufacturing method was applied to other Marudai techniques and the effectiveness of this method was verified. In addition, the factors affecting the radius of curvature were elucidated by comparing the structure of the braids produced from each technique. As the results of examining the unit mass, flexural rigidity, cross-sectional shape, and crimp curvature, it was found that there are two forces that promote and interfere with curvature, thus affecting the radius of curvature. This insight makes it possible to predict and design the presence or absence of curving, or a large or small radius of curvature, depending on the characteristics of each technique.

Interest in curves: when the radius of curvature matters in femur fractures. A CT based morphometric study.

In today's era, fractures of the femur are primarily managed with intramedullary devices. Keeping in mind the anatomical sagittal bow of the femur, intramedullary devices have been devised with an anterior bow, but this varies amongst various manufacturers - leading to complications such as anterior cortex impingement beyond the isthmus and posterior cortical opening at the fracture site. We intend to find the average radius of curvature (ROC) of the anatomical bow of the femur and the variation of the same. Radiographic data of 150 normal femur scans done in 81 patients were loaded in the Mimics 21.0 software (Materialise, Leuven, Belgium). A centerline (of the medullary cavity) was created using the software. A best-fit circle was created in the sagittal plane involving a major part of the centerline, and ROC was calculated. We found the average ROC of our data was 1027.2, with a standard deviation of 241.55. ROC and length of the femur (an indirect measure of height) had a slight positive correlation (r = 0.36; p < 0.05); and a highly positive correlation in the ROC of the left and right femurs of the same individuals (r = 0.605; p < 0.05). The usual ROC of intramedullary nails is commonly > 1300mm, much higher than the average ROC we identified in our population. Thus, we conclude that implants with smaller ROC in the range of 1100mm are needed, leading to better implant placement in the canal and avoiding complications of anterior cortex impingement and preventing fracture gap widening in our setting.

(Digital Presentation) Design of High Barrier Property and Flexible Inorganic/Polymer Hybrid Film for Encapsulation of Flexible Electronics

Designing encapsulation film with both high barrier property and excellent flexibility has been challenging for the current brittle inorganic films owing to the strain-induced cracking. Inorganic/organic multilayer has been proposed due to the organic layer can function as buffers of the inorganic layer and defect-decoupling layer, realizing the improvement of flexibility and maintaining barrier property. Polydimethylsiloxane (PDMS) was widely used as an organic encapsulation layer due to its high stability, elasticity, and transparency. The introduction of PDMS helps the barrier film to resist distorting under the bending motions. However, the delamination and cracking occurred under bending motion in a small curvature radius due to the mismatched strain and coefficient of thermal expansion (CTE) between PDMS and inorganic films such as Al2O3. Realization of improving their strain and CTE mismatch is possible by doping nanoparticles into PDMS. The Al2O3/PDMS hybrid film with the doping of SiO2 fabricated via atomic layer infiltration (ALI) method showed mechanical stability and endure 1000 repetitive stretch tests with 1%, but the water vapor transmission rate (WVTR) was only 10-3 g/m2/day, which was attributed to the lower crosslinking density of PDMS result in higher free volume and chain mobility. It’s a challenge to develop a strategy for improving the crosslink density of PDMS. In this work, the PDMS-based composite substrate with engineered stiffness was developed by employing the addition of silane coupling agent and SiO2. Atomic layer infiltration (ALI) coupled with UV-curing was introduced for sub-surface cross-linking of PDMS in Al2O3/SiO2/PDMS hybrid film, and the resulted Al2O3/SiO2/PDMS hybrid film showed highly stretchable and barrier properties. The result indicates that Al2O3/SiO2/PDMS hybrid film is a promising encapsulation film applicable to flexible electronics.Keywords: atomic layer infiltration (ALI), flexible film, encapsulation, UV-curing method, water vapor transmission rate (WVTR)Refs. Y. Li, D. Wen, Y. Zhang, Y. Lin, K. Cao, F. Yang, R. Chen, Highly-stable PEN as a gas-barrier substrate for flexible displays via atomic layer infiltration, Dalt. Trans. (2021) 16166–16175. https://doi.org/10.1039/d1dt02764f.Zhang, D. Wen, M. Liu, Y. Li, Y. Lin, K. Cao, F. Yang, R. Chen, Stretchable PDMS Encapsulation via SiO2 Doping and Atomic Layer Infiltration for Flexible Displays, Adv. Mater. Interfaces. 9 (2022) 1–9. https://doi.org/10.1002/admi.202101857.

The effect of heating rate on sintering mechanism of alumina nanoparticles

AbstractThe densification process of sintered alumina is mainly controlled by surface, lattice, and interface diffusion, and many experimental researches show that heating rate can affect the transfer of matter. Thus, to further reveal the effect of heating rate on sintering mechanism of alumina nanoparticle, molecular dynamic simulations were performed at five different heating rates to examine the migration of atoms and evolution of microstructure in heating stage. Results show that the sintering process of heating is a typical thermal activation process. High displacement response temperature is caused by high heating rate, which results in the mechanism of atomic migration quickly changing from surface diffusion to overlapping of surface, interface, and lattice diffusion. Nonuniform microstructure and asymmetrical sintered neck forms due to unstable and nonuniform mass transfer. Sintered neck with small radius of curvature leads to high shrinkage rate and large driving force. The sintering mechanism is expected to be helpful for understanding or developing new fast sintering methods for ceramics.

Preliminary Study of 4 T Superconducting Dipole for a Light Rotating Gantry for Ion-Therapy

A collaboration between CERN, CNAO, INFN, and MedAustron has been formed aiming at designing a light rotating gantry suitable for hadron therapy based on 430 MeV/n carbon ion beams. After a first design for a 3 T dipole field, as the backbone of the gantry magnetic system, now the collaboration is looking at an alternative design, for at least 4 T field with a faster ramp rate. The magnet is designed according to the cosθ layout to be wound with Nb-Ti superconducting Rutherford cable. One of the main challenges is the very small curvature radius of 1.65 m with a relatively large aperture, of 70-90 mm. Another challenge is the use of indirect cooling despite the cycling operation of 0.4 T/s. The paper reports the preliminary investigation for a 4.5 T dipole. The design will be followed by the construction of a 1 m long demonstrator to be manufactured and tested at INFN (LASA laboratory) in about three years. The conductor is a Rutherford cable of 2.6 µm Nb-Ti filament size, embedded in a Cu-Mn alloy matrix. The resulting gantry is very compact: the collaboration is working on integration between gantry structure and magnets to allow reducing the rotating weight in the range 50-80 tons, which is a factor 4 to 5 less than the present state-of-the-art.

Local impact resistance of curved sandwich panels with coaxial and concentric honeycombs

The local impact resistance of honeycomb sandwich panels with curved and flat geometries differs due to the global stress state. In this study, curved sandwich panels with coaxial and concentric honeycombs are designed and their resistance is investigated against local impact. The numerical model is calibrated with the air cannon test results and then used to compare the performance of structures that are sandwiched by different honeycombs. The comparable study shows that the impact resistance of flat sandwich structures outperforms that of curved ones at a low impact velocity, and a small radius of curvature should be avoided when considering an enhancement of the impact resistance by curvature design. In addition, under the high-velocity impact, sandwich panels with concentric honeycombs show an improved impact resistance as compared to those with coaxial honeycombs. However, the influence of honeycomb configurations on the impact resistance is reduced as the radius of curvature increases. Using the equivalent analysis, the equivalent face sheet thickness and equivalent impact velocity of curved sandwich structures with different radii of curvature, which are compared to the flat structures that are subjected to typical impact loads, are achieved.

Increased femoral curvature and trochlea flexion in high-grade patellofemoral dysplastic knees.

High-grade patellofemoral dysplasia is often associated with concomitant axial and frontal leg malalignment. However, curvature of the femur and sagittal flexion of the trochlea has not yet been studied in patellofemoral dysplastic knees. The aim of the study was to quantify the femoral curvature and sagittal flexion of the trochlea in both high-grade patellofemoral dysplastic and healthy knees. A retrospective case-control study matched 19 high-grade patellofemoral dysplastic knees (Dejour types C and D) with 19 healthy knees according to sex and body mass index. Three-dimensional (3D) femoral curvature and sagittal trochlea flexion were analysed. To analyse femoral curvature, the specific 3D radius of curvature (ROC) was calculated. Trochlear flexion was quantified through the development of the trochlea flexion angle (TFA), which is a novel 3D measurement in relation to the anatomical and mechanical femur axis and is referred to as 3D TFAanatomic and 3D TFAmech. The influence of age, gender, height, weight and frontal and axial alignment on ROC and TFA was analysed in a multiple regression model. Overall ROC was significantly smaller in dysplastic knees, compared with the control group [898.4 ± 210.8mm (range 452.9-1275.1mm) vs 1308.4 ± 380.5mm (range 878.3-2315.8mm), p < 0.001]. TFA was significantly higher in dysplastic knees, compared with the control group, for 3D TFAmech [13.8 ± 7.2° (range 4.4-33.4°) vs 6.5 ± 2.3° (range 0.8-10.2°), p < 0.001] and 3D TFAanatomic [12.5 ± 7.2° (range 3.1-32.2°) vs 6.4 ± 1.9° (range 2.1-9.1°), p = 0.001]. A smaller ROC was associated with smaller height, female gender and higher femoral ante torsion. An increased TFA was associated with valgus malalignment. High-grade patellofemoral dysplastic knees demonstrated increased femoral curvature and sagittal flexion of the trochlea, compared with healthy knees. The ROC and newly described TFA allowed the quantification of the sagittal femoral deformity. TFA and ROC should be incorporated in future deformity analysis to investigate their potential as a target for surgical correction. Level III.

Deformation behavior of an A356 alloy containing small sub-grains with wide low-angle boundary

We introduce a new method for overcoming the strength–ductility trade-off by using a non-metallic alloying method, whereby numerous oxygen atoms are introduced in a conventional A356 alloy (I-A356 alloy). Self-organized nanofibers containing oxygen atoms formed in the melt had a chemically coherent interface with the matrix after solidification. Furthermore, the nanofibers (~10 nm in width) developed small sub-grains (<1 μm in size) with wide low-angle boundaries within the grains. Pre-existing dislocations developed by the small lattice mismatch between the nanofibers and matrix promoted strong activities. The sub-grain boundaries do the role of dislocation cells during plastic deformation, imparting high elongation to the I-A356 alloy. In addition, finely dispersed Si-rich nanoprecipitates formed during the aging treatment. The oxygen-rich intermixed layer at the Al–Si interfaces with a small radius of curvature drove Al–Si interdiffusion owing to the high attractive binding energy with Al. Thus, in addition to Mg2Si precipitates, the Si-rich nanoprecipitates further enhanced the alloy strength. Therefore, both, the ultimate tensile strength and elongation to failure of the I-A356 alloy, significantly increased by approximately 69.6 MPa and 14.8%, respectively, in relation to those of the A356 alloy.

Determination of the Influence of Strut Connector on Stent Deployment

Coronary artery stents are tubular structures employed together with angioplasty. Stented angioplasty is a clinical procedure widely applied in the treatment of atherosclerosis to reopen the blocked artery. It is a simple and fast curing minimally invasive clinical procedure. However, it is essential to understand the expansion characteristics of a stent before implantation since the stent geometry, inflating pressure, etc., influence the performance of stents. Finite element analysis and in vitro experiments are simultaneously employed before clinical testing to predict the characteristics during deployment. In this paper, the expansion and deployment characteristics of Meril Osum 2.75 × 24 coronary stent and Envision 3.5 × 28 stent were investigated to study the influence of strut connector on the expansion behaviour of the stent by experimental and computational methods. The current study analyzes the real-time deployment characteristics such as rate of expansion, stress on stent, recoil, dog boning, and foreshortening. The stent expansion characteristics obtained from experiments and simulations were found matching and observed that strut connector has a significant effect on stent expansion. Further, the curved connector of small radius of curvature shows better performance with high patency rate.

Numerical study on fire-induced smoke temperature characteristics in small curvature radius UTLT-like tunnels under emergency state

Extensive studies have usually focused on an ordinary single straight or large curvature radius tunnel fire. However, the curvature effect of small curvature radius curved tunnel on the fire-induced smoke temperature characteristics still needs to clarify. Therefore, a three-dimensional transient computational fluid dynamics (CFD) fire model for small curvature radius urban traffic link tunnel (UTLT)-like tunnel was established to understand the scope and extent of curvature effect on the fire-induced smoke under emergency state. The results show that, in the curved tunnel area, small curvature radius or large critical ventilation velocity results in stronger centrifugal force of the fire smoke, readily destabilizing the fire smoke downstream of the fire source. Compared with large radius of curvature and straight tunnels, due to the greater resistance of curved walls in small curvature radius tunnel, the length of smoke back-layering is longer. Simultaneously, the temperature of the high-temperature smoke on the outer wall of the ceiling cross section is higher than the inner wall. Prediction mathematical models for the maximum temperature and longitudinal temperature profiles were further developed by taking the curvature and ventilation velocity effect, which is basically consistent with experimental and simulated results.

Study on surface properties and fatigue performance of aluminum alloy plate with prestressed ultrasonic peening

Prestressed ultrasonic peening (UP) is beneficial to enlarge bending deformation and improve surface properties of the plate compared to free UP process. The effects of processing parameters on variation of surface topography, surface roughness and hardness, residual stress distribution are analyzed. Then the microstructure and fatigue life with prestressed UP is studied. The results show that smaller surface roughness, larger surface hardness, larger and deeper compressive residual stress are generated in prestressed UP compared to free UP. Small prebending curvature radius and offset distance both contribute to enhancement of surface properties. Large firing pin velocity is beneficial for large surface hardness as well as larger and deeper compressive residual stress; nevertheless, it will increase the surface roughness. The UP process mainly improves the high cycle fatigue life of the material, while there is no difference of the low cycle fatigue life between the peened and un-peened samples. The high cycle fatigue life significantly increases at small stress after peening process and it can be further enhanced after prestressed UP. Deformation band with peened indentations are generated on the surface. With the experiments of distributions for hardness, yield stress and residual stress, the strengthening mechanism in peening process is discussed.

Observation of microcavity fine structure

We observe fine structure in the resonance spectra of optical microcavities. We identify the polarization-resolved modes in the spectrum and find that resonance frequencies split in accordance with the theoretical prediction. The observed fine structure is dominantly caused by an optical spin-orbit coupling and non-paraxial propagation and reflection. Both effects are intrinsic, i.e. present in an ideal rotation-symmetric system, and scale inversely proportional to the mirror radius of curvature. For cavities with a small radius of curvature, the influence of fine structure on the resonance spectrum is important and unavoidable and should thus be taken into account.

Fabrication of soft x-ray monolithic Wolter mirror based on surface scanning measurement using touch probe.

The monolithic Wolter mirror is an ideal optical device for focusing soft x rays to a submicron-sized spot, with the advantages of high efficiency, large acceptance, achromaticity, and robustness to alignment error. The fabrication process for this type of mirror has not been established because of the difficulty in highly accurate figure measurement of free-form surfaces with small radii of curvature and steep profiles. In this study, we employed tactile scanning measurement for surface characterization to fabricate a high-precision Wolter mirror. First, it was demonstrated that the touch probe measurement did not leave scratches on the raw surface of the mirror substrate. Next, the measurement capability of the surface profiler was assessed, and the data analysis conditions were determined. Finally, the Wolter mirror was fabricated through repeated figure correction based on the tactile measurement, and the figure error of the final surface was evaluated. Wave-optical simulations that used this error as reference suggested that the size of the beam focused by the mirror was equivalent to the theoretical value at 1000 eV. The reflected image with uniform intensity distribution obtained at SPring-8 also revealed the effectiveness of the present fabrication approach based on tactile measurement.

Flexible all-inorganic Sm-doped PMN-PT film with ultrahigh piezoelectric coefficient for mechanical energy harvesting, motion sensing, and human-machine interaction

In the era of artificial intelligence and the internet of things, the emergence of flexible MICAtronics, heterostructures made by van der Waals epitaxy on layered mica, has attracted great research interest due to applications in the fields of flexible ferroelectric memory, dielectric capacitors, and others, but less effort has been dedicated to the realization of flexible piezoelectric inorganic films for energy harvesters and sensors. In this work, an all-inorganic transparent Sm-doped Pb(Mg1/3Nb2/3)O3-PbTiO3 (Sm:PMN-PT) film has been successfully grown on Mica substrate via a simple one-step sol-gel process. The flexible film shows an ultrahigh piezoelectric coefficient d33 of 380 pm V−1 owing to the enhanced local structural heterogeneity and the weak substrate clamping effect. Simultaneously, superior flexibility is realized without sacrificing its electrical performance, as reflected by withstanding a small radius of curvature of 2 mm and even 103 mechanical bending cycles. Utilizing this Sm:PMN-PT film, the fabricated device exhibits an excellent energy harvesting performance with output voltage of 6 V, current density of 150 μA cm−2, andultrahigh force sensitivity of 5.86 V N−1. Besides, it also possesses a certain temperature resistance and favorable hydrophobicity. In practical applications, it can not only be employed to monitor body motions, including finger pressing, hand tapping, foot stepping, finger/wrist bending, and hand grasping, but also serves as a tactile sensor to record the touch of a finger to unlock a smartphone. This work demonstrates that the flexible PMN-PT based film on Mica substrate has full application potential in mechanical energy harvesting, motion sensing, and human-machine interaction.

A super-flexible and transparent wood film/silver nanowire electrode for optical and capacitive dual-mode sensing wood-based electronic skin

A Super-flexible and transparent wood film/silver nanowire electrode for optical and capacitive dual-mode sensing wood-based electronic skin. This work opens new directions for directly incorporating natural wood into e-skin sensors and may offer potential applications in wearable electronics, artificial intelligence, soft robots and so on. • A wood-based e-skin with instrument- and naked eye-readable characteristics. • A pyramidal microstructure polydimethlysiloxane film was used as a sensing layer. • A super-flexible transparent wood film was used as the electrodes. • The e-skin can map the spatial distribution of static and dynamic pressures. • The e-skin in luminescence exhibited a maximum sensitivity value at 1.28 kPa −1 . Flexible electronic skin (e-skin) with multimode broad-range pressure sensing and high sensitivity is highly desirable for robotics, artificial intelligence and human–machine interaction applications. Most research on e-skin has focused on improving the sensitivity of sensing layers interfaced with an electronic output device, with only a limited number of studies focused on user interfaces based on a human-readable output. Moreover, naturally degradable materials are receiving increasing attention for e-skin. Herein, inspired by a bioluminescent noctiluca, a wood-based e-skin with instrument- and naked eye-readable characteristics was sandwich assembled using silver nanowires and a super-flexible transparent wood (STW) film as an electrode and a pyramidal microstructure polydimethlysiloxane film as a stimuli-responsive layer. The electrode was prepared by depositing silver nanowires on the surface of the STW film through a Meyer rod coating method. The film demonstrated outstanding performance with high transmittance (91.4%), a small curvature radius (2 mm) and excellent sheet resistance stability even after greater than 1500 bending cycles. The e-skin showed notable changes in electroluminescence from 0 to 150 kPa (where humans feel pain) and the sensitivity remains larger than 0.15 kPa −1 over the broad pressure range. The sensitivity in capacitance exhibited high sensitivity at 1.01 kPa −1 in the low-pressure regime, meanwhile, the luminescence exhibited a maximum value at 1.28 kPa −1 at medium pressure. Furthermore, the e-skin accurately mapped the spatial distribution of static and dynamic pressures through optical sensing. This work not only improves the sustainable development of materials in electrodes but also illustrates the potential of utilizing natural wood in high value-added e-skin.